I spend this website many hours each week to share my knowledge and experience from the areas of Astronomy, Cars and Travels. Most pages are written in English that is not my own native language, so do not judge me too hard if you find grammatical errors and more.

Highlights!

(these pages could be a mix of Swedish and English)

Contents:

• NewsHighlights on Astrofriend's homepage, see also left column Latest News
• New linksInteresting information NEW November 26, 2023 !
• Must do stuffWhat makes your life valuable NEW August 2023 !
• Speech nature science, Föredrag naturvetenskap(most speeches in Swedish)

News:

Here I have collected news I found interesting.

Technology, Astronomy, Cars, Travels etc.

November 28, 2023 Astronomy: Astronomy Project

• With a working focuser I can start to use my APO refractor again. It's a TS130, 910 mm at f/7. It has collected dust for three years now:

  astronomy/ projects/ project-ts130-upgrade/ 01-project-ts130-upgrade.html
  (Project: TS130 upgrade)

Update:
Dew heater an lens cover, page 8
Triple DC/DC tests, page 6
Power splitter, page 7
Triple DC/DC converter, page 6
Brackets, page 4-5
Design of two stands, page 3
New power cables, page 2

Other astronomy projects:

November 27, 2023 Travel Europe

• Now it's October and in Sweden it's dark and cold. Time to travel South to Mediterranean. Spain is a nice country and we bought flight ticket to Alicante. The home flight goes from Barcelona:

  travel/ europe/ spain-alicante-barcelona-2023/ 00-alicante-barcelona.html
  (Alicante to Barcelona, Spain, 2023)

Update:
Castello to Peniscola online
Sagunto to Castello online
Valencia to Sagunto online
Valencia online
Denia to Valencia online
Benidorm to Denia online
Alicante to Benidorm online
3 first days in Alicante online

Other travels in Europe:

29 oktober, 2023 Resor till sjöss

Min fars äventyr som sjöman under åren 1937 till 1945:

• Vem har inte drömt om att göra en jorden runt resa någon gång i sitt liv. Min pappa Evert gjorde det redan innan han var 20 år fyllda. Han mönstrade på handelsfartyg och hamnade ända borta i Kina och andra länder i Asien. Det här skedde delvis under Andra Världskriget, det var många fartyg som gick under från minor och torpeder, även svenska fartyg. Tre av fartygen han var på förliste pga detta, dock något efter att han mönstrat av. Trevligt nog har jag en hel del bilder till pappas alla berättelser om de här 7 åren till sjöss. Denna spännande historia kan ni följa här:

  travel/ world/ evert-at-sea-1937-1945/ 01-evert-at-sea-start-sv.html
  (Min fars äventyr till havs åren 1937 - 1945)

Uppdatering:
Ny information om elektrikern Sven Eklund som omkommer då M/S Canton torpederas år 1939, sida 11.

Other history related:

October 23, 2023 Astronomy: Astronomy Project

• When I'm upgrading my TS130 APO refractor I also upgrade all devices around it. One of the devices is the guide camera, a ZWO ASI120mm USB2. Old today but still competitive as a guide camera. Found one big problem with it, it didn't work with Linux. Here I do an upgrade to make it work:

  astronomy/ projects/ project-asi120mm-upgrade/ 01-project-asi120mm-upgrade.html
  (Project: ZWO ASI120mm upgrade)

Other astronomy projects:

October 20, 2023 Astronomy: Astronomy Project

• Now when I almost finished the mechanical construction of my push pull screw focuser I must plan for the stepper motor controller. I need a hardware driver and control logic that can use INDI drivers:

  astronomy/ projects/ project-motor-focus-driver/ 01-project-motor-focus-driver.html
  (Project: Stepper motor driver)

Update:
5 kg load test, page 10
Enclosure, page 9
Setup INDI for MyFocuserPro2, page 8
Start assembling the circuit board, page 7
Schematics, page 6
Setup the Arduino system, page 5
Prototype setup, page 4
Purchasing needed components, page 3

Other astronomy projects:

October 19, 2023 Astronomy: Light pollution

• Eight years ago I wrote about an idea how to fight light pollution. It was made by synchronize the camera shutter with street LED lights:

  astronomy/ projects/project-light-pollution/project-light-pollution.html
  (Project: Light pollution handle by synchronized camera shutter)

Now they have done a test with this technology in Caucasus Mountains, link at bottom of above page.

Other astronomy projects:

October 17, 2023 Astronomy, nebula

From my balcony it's not so easy to get objects in view. But at this time f the year I can get a glimpse of the Carb Nebula. Observed already 1054 by Chinese astronomers when the star exploded:

The nebula M1, Crab Nebula:

• astronomy/ astronomy-photo/ nebulas/ m1/ m1-crab-nebula.html
  (Crab Nebula, M1)

astronomy/ astronomy-photo/ nebulas/ astronomy-photo-nebulas.html Other nebulas.

October 12, 2023 Astronomy, Planetary nebula

One forgotten planetary nebula I found in my archive from 2016, Dumbbell Nebula, M27:

The Dumbbell Nebula, M27:

• astronomy/ astronomy-photo/ planetary-nebulas/m27/ m27-planetary-nebula.html
  (Dumbbell Nebula, M27, 2016)

astronomy/ astronomy-photo/ planetary-nebulas/ astronomy-photo-planetary-nebulas.html Other planetary nebula photos.

October 11, 2023 Astronomy, nebula

To take a photo of a nebula from a Bortle class 9 environment is a challenge. California nebula has magnitude 6 and I gave it a try. There is possible to see it, that was more than I had hoped for:

The California nebula, NGC 1499:

• astronomy/ astronomy-photo/ nebulas/ ngc1499/ ngc1499-nebula.html
  (NGC 1499)

astronomy/ astronomy-photo/ nebulas/ astronomy-photo-nebulas.html Other nebula photos.

October 10, 2023 Astronomy, open cluster

Open clusters are always easy to take photographs of even in hard light polluted environments. This open cluster was discovered for more than 300 years ago, Messier 34. Added side by side comparison between 1 hour and 2 hours exposure:

The open cluster M34:

• astronomy/ astronomy-photo/ open-clusters/ m34/ m34-open-cluster.html
  (Messier 34)

astronomy/ astronomy-photo/ open-clusters/ astronomy-photo-open-clusters.html Other open clusters photos.

October 1, 2023 Astronomy, photography

Some new test astrophotographys from the balcony:

• IC 417 nebula
• NGC 2403 galaxy
• Andromeda M31 galaxy

astronomy/ astronomy-photo/ astronomy-photo-menu.html Other astro photos.

September 26, 2023 Astronomy: Project

• Since two years I have used a Linux based control system for my astro equipment. In the Windows world it's ASCOM drivers you use, in Linux it's INDI drivers. The INDI EQMOD driver control SkyWatcher's mounts. It's an old driver and I have to fix one or two problems with it. It's written in C++. It was 27 years ago I did something with C++, so it's a big step for me, but now I must solve it:

  astronomy/ projects/ project-indi-drivers/ 01-project-indi-drivers.html
  (INDI EQMOD driver)

Updated information.

Other astronomy projects:

September 24, 2023 Historia, Nya Slussen byggs upp

• Åter en dag som vi passerar Slussen, idag får vi möjlighet att se in i slusskanalen och hur det arbetet fortskrider.

  history/sverige-stockholm-slussen/ sverige-stockholm-slussen-start.html
  (Gamla slussen rivs och Nya Slussen byggs, Stockholm)

  Vid en ny promenad genonm slussområdet i september ser vi några få nya arbeten pågå.

Andra saker om Sveriges historia:

September 17, 2023 Astronomy, observatory sites

I got a new friend in the astronomy hobby, Michael. He has his own private observatory that I was invited to visit:

Michael's Torö observatory, Sweden:

• astronomy/ observatory-sites/ toro-michael-observatory/ toro-michael-observatory.html
  (Michael's Torö observatory, 2023)

Other observatory sites:

September 4, 2023 Astronomy, comet

I'm started this astronomy season early, already in late august. It's not dark enough but good to get some practice. My first target is a small comet, 103P Hartley 2. It's just outside our balcony in Eastern direction:

The comet 103P Hartley 2:

• astronomy/ astronomy-photo/comets/ ztf-c2022-e3/ ztf-c2022-e3.html
  (Comet ZTF C/2022 E3)

Update:
Added magnified photos of the comet and the galaxy.

astronomy/ astronomy-photo/ comets/ astronomy-photo-comets.html Other comet photos.

August 26, 2023 Astronomy: Project

• Now it's the beginning of the astronomy season and all problem must be solved. Earlier in the spring I had big problem with the GPS sync of time and position. Especially when doing Polar alignment. It need the Raspberry's system clock to be set correctly direct, not just a offset how much wrong it's relative satellite clock. Now with the Chrony driver I got some better work of it. Have a look at this page:

  astronomy/ projects/ project-heq5/ 07-heq5.html
  (Setup GPSD in INDI)

Other astronomy projects:

August 18 20, 2023 Travel Europe

• Late in the summer I got a cruise as a birthday gift, it take us to Finland and the city Turku or Åbo as we say in Sweden. I haven't been there since the 1970s so it will be exiting. Finland belonged to Sweden during 700 years, we lost it 1809 in a war:

  travel/ europe/ finland-turku-2023/ finland-turku.html
  (Turku in Finland, 2023)

Other travels in Europe:

23 juli, 2023 Historia, Brunnsviken

• Nu börjar det närma sig slutet av juli, vi passar på att ta en cykeltur till Brunnsviken från där vi bor i Hagsätra. Det är en dryg mil att cykla in till city i Stockholm och nu skall vi lite längre till norra staden. Under cykelturen får vi se gamla minnen från vår egen uppväxttid och en hel del betydligt äldre historia.

  history/ hagsatra-brunnsviken/ 01-hagsatra-brunnsviken-sv.html
  (Cykeltur från Hagsätra till Brunnsviken i Solna med lite historia)

Andra saker om Sveriges historia:

July 12, 2023 Car meetings

• One place where they have car meetings here close to Stockholm is Björnlunda. Never been visiting that place earlier:

  vehicles/ bjornlunda-2023/ bjornlunda-2023.html
  (Björnlunda car meeting, 2023)

Other car meetings in Sweden:

May 20, 2023 Travel Europe

• After our exciting travel in Northern Germany by train last year we are now drawing new plans for a travel in Southern Germany:

  travel/ europe/ germany-southern-2023/ 00-germany-southern.html
  (Southern Germany by train, 2023)

Other travels in Europe:

April 19, 2023 Astronomy: Tutorial

• A year ago I started to use Siril for my pre processing astrophoto work. Works very well and I use it lot now:

  astronomy/ tutorials/ tutorial-siril/ 01-tutorial-siril.html
  (How to use Siril for pre processing astrophotos)

Update;
Meridian flip and stacking, page 7
Adjust the flat calibration with a fake bias, page 6
Dark calibration analyze, page 5
Calibration test, page 4
More details on page 2 and 3

Other astronomy tutorials:

15 april, 2023 Astronomi, Historier

• Kanske en av de sista bilturerna ut till Björnöreservatet denna säsong. Nu tycker jag att jag lärt mig alla fallgropar att få utrustningen att fungera ute i kylan och mörkret. Kommer det bli några vackra astronomibilder eller kan det fortfarande gå fel ?

  astronomy/ astronomy-stories/ astrofriend-night-diaries/ astrofriend-night-diary-20230415-se.html
  (Sen vintersäsong till Björnö)

Andra astronomihistorier:

April 16, 2023 Astronomy, galaxy

One more photo of the pair of galaxies M81 & M82. I'm in hurry now, not many dark nights left this season:

The galaxies M81 & M82:

• astronomy/ astronomy-photo/ galaxies/ m81/ m81-m82-galaxies.html
  (M81 & M82)

astronomy/ astronomy-photo/ comets/ astronomy-photo-galaxies.html Other galaxy photos.

April 12, 2023 Astronomy, nebula

Now it's very bright at nights, maybe the last deep sky object this season, the nebula NGC 7023:

The nebula NGC 7023, Iris Nebula:

• astronomy/ astronomy-photo/ nebulas/ ngc7023/ ngc7023-nebula.html
  (NGC 7023)

astronomy/ astronomy-photo/ nebulas/ astronomy-photo-nebulas.html Other nebulas.

March 17, 2023 Astronomy, double star

Meet my three new friends up on the night sky:

Chi Draconis, Cor Caroli and Grumium are double stars:

• astronomy/ astronomy-photo/ double-stars/ chi-draconis/ chi-draconis.html
  (Chi Draconis, spectroscopic double star)
• astronomy/ astronomy-photo/ double-stars/ cor-caroli/ cor-caroli.html
  (Cor Caroli, binary double star)
• astronomy/ astronomy-photo/ double-stars/ grumium/ grumium.html
  (Grumium, binary double star)

Other double stars:

March 12, 2023 Astronomy: Tutorial

• Long time since I wrote something about Gimp, I still practicing. The latest is how to correct for bad flat calibrated images or even them without flat calibration images. I have also updated the older pages where I have found some mistakes:

  astronomy/ tutorials/ tutorial-gimp-astrophotography/ 01-tutorial-gimp-astrophotography-introduction.html
  (How to use Gimp for editing astrophotos)

Other astronomy tutorials:

March 10, 2023 Astronomy, planetary nebula and global cluster

My Pentax 645 300 mm f/4 lens closing in to perfection. What happens when I try to photograph small planetary nebulas or small globular clusters ? Objects that's normally taken with at least three times longer focal lengths:

The planetary nebula M57:

• astronomy/ astronomy-photo/ planetary-nebulas/ m57/ m57-planetary-nebula.html
  (M57)

astronomy/ astronomy-photo/ open-clusters/ astronomy-photo-planetary-nebulas.html Other planetary nebulas.

March 9, 2023 Astronomy: Project

• This time I take a look at the focus and the temperature, how long time does it take to stabilize ?

  astronomy/ projects/project-pentax645-300ed/ 01-pentax645-300ed.html
  (Pentax 645 300 mm f/4 ED lens)

Other astronomy projects:

March 4, 2023 Astronomy, open cluster

This night wasn't good enough weather to take the car out to a dark place. I did this observation from our balcony instead. When astrophotographing from the balcony it's easier if the objects bright, stars are easier than deep sky object. I found that I had the open cluster NGC 6939 coming up from North:

The open cluster NGC 6939:

• astronomy/ astronomy-photo/ open-clusters/ ngc6939/ ngc6939-open-cluster.html
  (NGC 6939)

astronomy/ astronomy-photo/ open-clusters/ astronomy-photo-open-clusters.html Other open clusters photos.

February 28, 2023 Cars, Chrysler Crossfire radio:

• My car is 17 years old and still have the original radio installed. Good sound but it doesn't have Bluetooth or USB connector. Now it's time to replace it with something more modern:

  vehicles/ my-cars/ chrysler-crossfire/ radio-replace/ 01-radio-replace.html
  (Radio and booster replacement)

Other DIY repair tips for Chrysler Crossfire (Mercedes):

February 27, 2023 Astronomy: Tutorial

My Canon 6D has always been very slow with download image files from the camera to the astroserver. This is more an investigating if there is someway to come around this. Asking at forums now and collecting information:

• astronomy/ tutorials/ tutorial-canon6d-data-transfer/ 01-tutorial-canon6d-data-transfer.html
  (Canon slow data transfer)

Other astronomy tutorials:

February 19, 2023 Astronomy, asteroid

At one night with clear night I found that I have an asteroid in the view from the balcony, Ceres. This was the first asteroid to be found and that already 1801. Today it belongs to the group Dwarf planets:

The asteroid Ceres:

• astronomy/ astronomy-photo/ asteroids/ ceres/ ceres.html
  (Ceres)

astronomy/ astronomy-photo/ comets/ astronomy-photo-asteroids.html Other asteroid photos.

February 7, 2023 Astronomy: Project

• The last days I have designed a battery bracket for my telescope. It's not water prof so it shouldn't stand on the ground. This bracket is attached on one of the legs on the mount, a HEQ5:

  astronomy/ projects/ project-small-practical-knobs-brackets/ 06-project-small-practical-knobs-brackets.html
  (Battery bracket, practical small brackets)

Other astronomy projects:

6 Februari, 2023 Astronomi, Historier

• En kvällstur till Tyresta Naturreservat för att fota kometen ZTF

  astronomy/ astronomy-stories/ astrofriend-night-diaries/ astrofriend-night-diary-20230205-se.html
  (En kvällstur till Tyresta)

Andra astronomihistorier:

January 29, 2023 Astronomy: Calculations

• Comet's speed differ from the sidereal rate. In most mounts a correction of the mounts speed can be input. Often these values are expressed in degrees/hour but need to be in arcsec/sec. I have done a calculator that do this conversion on my homepage:

  astronomy/ astronomy-calculations/ angle-conversions/ angle-conversions.html
  (Angle calculations)

Other astronomy calculations:

January 24, 2023 Astronomy: Project

• Long time ago I started a Flat Field Calibrator project where I use a LED stripe and 3D-printed parts. Got a lot of problem with the 3D-printer and the project fell in sleep. Now I started it up again:

  astronomy/ projects/ project-flat-calibrator/ 01-project-flat-calibrator.html
  (DIY/3D Flat field calibrator)

Other astronomy projects:

January 16, 2023 Astronomy: Tutorial

One of my first tutorials I wrote was about how to do a relative guiding on comets. It guide on a star and the computer calculate the offset speed between the star and the comet and correct for that. I have looked through the text and updated links and added more photos. The software has developed a lot but still the principle is the same:

• astronomy/ tutorials/ tutorial-gimp-astrophotography/ 01-tutorial-gimp-astrophotography-introduction.html
  (Comet relative guiding)

Other astronomy tutorials:

12 januari, 2023

Mörka observationsplatser: Astronomi

Titta på dessa två videor tagna från England respektive Teneriffa.

• https://www.youtube.com/ watch?v=3mb8vBmCzvo
  (Is this the Most Powerful Little Telescope in the Universe? Astrobiscuit YouTube)

England har ungefär samma klimat som vi har i Sverige, känner ni igen er ?

• https://www.youtube.com/ watch?v= fdQgBnEWHdY
  (Observing and Imaging Milky Way from dark skies of Tenerife, Refreshing views YouTube)

6 timmars flygresa och man har det så här. De här farbröderna har verkligen förstått hur man kan njuta av sin favorithobby.

Andra observationsplatser i Stockholm:

December 19, 2022 Astronomy, double star

From our balcony with a very narrow view there are not many objects to choose from. This night I took photos of Messier 40. An optical double star:

M40 an optical double star:

• astronomy/ astronomy-photo/ double-stars/ m40/ m40.html
  (M40 an optical double star)

Other double stars:

December 7, 2022 Astronomy, solar eclipse history

I have asked all my friends and relatives if someone have a memory from Sweden's last total solar eclipse 1954. I got an enormous response with lot of stories about this. I have collected them on a separate page and included some other information:

The Solar eclipse 1954 in Sweden:

• astronomy/ astronomy-articles/ solar-eclipse-1954/ solar-eclipse-1954.html
  (Solar eclipse 1954 in Sweden)

Other astronomy articles:

December 6, 2022 Astronomy: Events reports

• I have collected my Astronomy events reports at one page:

  astronomy/ astronomy-articles/ astronomy-events-reports.html
  (Astronomy Events reports)

Other astronomy events reports:

November 24, 2022 Astronomy: Project

• I have the last twenty years thought about medium format cameras. Later years digital mirror less cameras are much cheaper and have CMOS sensors which make them better. Maybe I will stay with full frame, but now I try to design an off-axis adapter with two filter drawers, just to see if I can fit it in the limited space:

  astronomy/ projects/ project-medium-format-offaxis/ 01-project-medium-format-offaxis.html
  (Medium format off-axis adapter 3D CAD)

Other astronomy projects:

September 11, 2022 HIFI

• At a car meeting I sat with my friends and got nostalgic. We talked about old HIFI and what we have had in earlier days. Here I have wrote it down:

  sound-image/ hifi-1970s-1980s/ 01-hifi.html
  (My HIFI in the 1970s to 1980s)

Other Sound and Image:

August 21, 2022 Boats / Monalisa

• Stefan has sent me even more photos of his renovation of his boat Ellinor, sister boat to my father's Monalisa:

  vehicles/ everts-cruiser-monalisa/ everts-cruiser-monalisa.html
  (Photos of the anchor)

Other ships and boats:

29 juli, 2022 Historia, Stockholm

• I Stockholm finns många spännande platser att undersöka. Ett av dom är Västra Stambanans gamla dragning mellan Liljeholmen och Södra Station på Södermalm. Den sträckan lades ned år 1929 då tågtrafiken flyttade till nya Årstabron.

  history/ vastra-stambanan/ 01-vastra-stambanan-sv.html
  (Västra Stambanan, Stockholm)

Andra saker om Sveriges historia:

6 juli, 2022 Historia, Galgbackar

• Under ett par vandringar i Stockholms Stad med omgivningar har vi undersökt de platser där folk avrättats i gångna tider, Stockholms galgbackar.

  history/ galgbackar-stockholm/ 01-galgbackar-stockholm-sv.html
  (Avrättnings och galgbackar i Stockholm)

Andra saker om Sveriges historia:

June 2, 2022 Travel Sweden

• Steam trains are always exiting, I have done two travels with a steam train from Stockholm City to Nynäshamn. Both of them at Christmas. One more visit to the train museum at Nynäshamn:

  travel/ sweden/ nynashamn-steamtrain-2005-2009/ 01-nynashamn-steam-train.html
  (From Stockholm City to Nynäshamn by Steam train, Sweden from 2005 to 2009)

Other travels in Sweden:

30 april, 2022 Nöjen i Stockholm

Takpubar och restauranger:

• Nu till årets sommar kan vi nästan koppla av från Covidbekymren. Vi vågar gå ut igen och träffa folk med viss försiktighet. Sommarens projekt blir att besöka några av Stockholms takpubar och restauranger. De har blivit väldigt populära på senare år. Här har jag listat de mer kända och gjort en karta så ni hittar dit:

  pleasure/ takpubar/ takpubar.html
  (Listor och kartor över takpubar och restauranger i Stockholm)

Andra nöjen: Nöjen i Stockholm

28 mars, 2022

Mörka observationsplatser: Astronomi

• I södra Stockholm på ön Torö är man långt från stadens ljus. Här är några foton från en parkering i naturreservatet.

• Örudden på Torö:

  astronomy/ observationsplatser/ orudden/ observationsplats-orudden.html
  (Observationsplatser Örudden Torö, Stockholm)

Andra observationsplatser i Stockholm:

All other news: News.

October, 2022 Astronomy, Impact structures (meteorite craters)

In Mars 2022 I passed close to the lake Västra Styran. I know I have read about it somewhere that it's maybe an old meteorite crater:

• astronomy/ meteorite-craters/ impacts.html
  (Meteorite crater Västra Styran, 2022)

It's no 10 on the map.

other meteorite craters:

Mars 17, 2022 Astronomy: Project

• Recently I bought a HEQ5 mount. My idea is to use that mount when travel by my car. Much less weight compare to my EQ6 mount. When I'm using my 300 mm lens I don't need the stability of the EQ6, and the HEQ5 mount has about the same precision. Problems solve: the serial cable, the EQDIRECT has not the same connector and not so good power connector:

  astronomy/ projects/ project-heq5/ 01-heq5.html
  (Project: HEQ5)

Other astronomy projects:

January 29, 2022 Astronomy: Project

• My old project with a Raspberry Pi2+ as an astroserver never worked very well, the process power from the computer was to weak. Now I do a new project of it with the new power full Raspberry Pi4 with 4 GB RAM:

  astronomy/projects/project-kstars-raspberrypi4/ 01-project-kstars-raspberrypi4.html
  (Project: Raspberry Pi4 as an astroserver)

Other astronomy projects:

January 16, 2022 Astronomy, Seven stars in Big Dipper, part of constellation Great Bear

Tonight I have problem which object on the heaven I wanted to take photo of. Then I saw that I had the constellation Great Bear outside the window. Why not take photos of the seven stars that built the Big Dipper which is a part of the Great Bear ? Afterwards I can analyze the images and see what's more there, sounds a bit exiting to me:

• astronomy/ astronomy-photo/ double-stars/ big-dipper-stars/ big-dipper-stars.html
  (Seven stars in Big Dipper)

Other stars:

January 5, 2022 Astronomy tutorial: Ekos Sequencer

• Included in the KStars is the Ekos. Ekos control the devices in your astroequipment. Included in this is a sequencer, a tool where you can hold your evening objects and the sequencer pick them up one by one in the most useful order. This is something new to me and all these advanced function is operated by the tiny Raspberry processor:

  astronomy/ tutorials/ tutorial-ekos-sequencer/01-tutorial-ekos-sequencer
  (Ekos Sequencer)

Other astronomy tutorials:

January 11, 2022 Astronomy: Lens data base

• When using a lens' built in focus motor it could behave different when controlling focus by remote. I have here collected some information from APT forum to get a better overview of which lenses is to prefer to use for astrophoto in that sense:

  astronomy/ tutorials/ database-apt-focus-af-mf-lenses/ database-apt-focus-af-mf-lenses.html
  (Data base: lenses autofocus behavior when remote controlled)

Other astronomy tutorials:

September 1, 2021 Bilskrotar kartor:

• För dig med gammal klassisk bil, när reservdelarna inte finns att köpa nya längre så blir man hänvisad till bilskrotarna. Jag har kompletterat mina tidigare listor med kartor för att lättare finna dom:

  vehicles/ bilskrotar/ bilskrotar-sverige.html
  (Bilskrotar Sverige)

Övrigt skrotbilar:

April 15, 2021 Astronomy: Project

• My friend Lars B do most of his projects from the very basic, cast worm gears, 3D-print details etc:

  astronomy/ projects/ project-do-it-from-basic-by-larsb/ 01-do-it-from-basic-by-larsb.html
  (Project: Lars B's projects)

Other astronomy projects:

Mars 23, 2021 Astronomy

prof Gösta Gahm

I, prof Gösta and Peter at the Sweden Solar system presentation, Gunilla is the photographer.

Something very sad has happen, in January 2021 I got the information that Gösta had passed away. We had known each other for more than 25 years, both I and Gunilla had him as a teacher in more than one courses we took in astronomy from 1995 to 2002 and we kept the contact since then. This meeting with the Jupiter model was the last time we saw him and at Christmas I got a greeting from him, since then nothing. Goodbye Gösta, we hope you have a great time up among the stars !

Gösta has one asteroid named after him: 10997 Gahm.

Lars and Gunilla

• astronomy/ astronomy-articles/ sweden-solar-system-jupiter-2019/ sweden-solar-system-jupiter.html
  (Sweden Solar system, Jupiter)
• https://en.wikipedia.org/ wiki/ Gösta_Gahm
  (Gösta Gahm, Wikipedia)

Other astronomy events reports:

29 januari, 2021 Resor till sjöss

Nyheter om det år 1940 förlista fartyget S/S Sylvia:

• En släkting till en av de omkomna har hittat till min sida om fartyget S/S Sylvia och har en del att berätta:

  vehicles/ ship-sylvia-1940/ 01-sylvia-sv.html
  (Fartyget S/S blir torpederat år 1940)

Other history related:

January 9, 2021 3D CAD

• In this project I make drawings for GT2 pulleys that I will use in my lens focuser:

  3d-printing/ camera-lens-focus-gears/ 01-camera-lens-focus-gears.html
  (Making drawings for GT2 pulleys to lens focuser)

Other 3D Printer and CAD projects:

August 17, 2020 Astronomy, meteor showers

In August we have the Perseid meteor shower, I did it a bit different this time. I used a GoPro camera:

• astronomy/astronomy-photo/ meteor-shower/ perseids/ perseids-2020/ perseids-2020.html
  (Perseid meteor shower, 2020)

Other meteor showers:

29 juli, 2020

Modellbåten Flamingo från Wentzel: Hobby

• När jag var omkring 9 år köpte min pappa mig min första modellbåt i trä. Den har nu efter 25 år på irrfärder hamnat hemma hos mig igen:

  vehicles/ models/ 02-wentzels-flamingo.html
  (Modellbåten Flamingo från Wentzel, hobby)

Andra båtar i full skala:

April 30, 2020 Home Theatre

• It's dark and winter now. I can't use my summer car and most days are cloudy so can't do my astronomy hobby either. What to do ? Restart my old hobby Home Theatre, of course !

  sound-image/ home-theatre-resurrection/ home-theatre-resurrection.html
  (Home Theatre resurrection, 2019)

Other Sound and Image:

November 8, 2019 Astronomy / seminar

• Seminars "The ALMA Fornax Cluster Survey" by Nikki Zabel.

  How does the galaxy cluster environment affect molecular gas and star formation? 2019
  (Institution of Astronomy, Stockholm's University)

Other speech, seminar and articles:

May 19, 2019 Sound / Image

• Biograf (Cinema) Sländan Museum:

  sound-image/ cinema-slandan-museum/ cinema-slandan-museum.html
  (Biograf Sländan Museum)
• We had a visit to a camera flee market today, we was a bit early and found this when we waiting, a cinema machine museum.

Other things about sound and cinema:

27 januari, 2019

Nya kartor över fornlämningar: Fornhistoria

• Kartor för fornfynd, det är för dig som gillar att vara ute i naturen och leta efter vår spännande historia.

• Här finner du de nya kartorna:

  history/ sverige-fornlamningar-kartor/ fornlamningar-kartor-sv.html
  (Fornlämningskartor, Sverige)

Other history related in Sweden:

All other news: News.

Must do stuff:

Technology, Astronomy, Cars, Travels etc.

(look carefully that it has not been canceled or has a changed date)

August 29, 2023 Astronomy

Comet C/2023 P1 Nishimura, very bright, mag 2.1 but very close to horizon, at September 16 only 5 degrees above.

• http://www.aerith.net/ comet/ catalog/ 2023P1/ 2023P1.html
  (C/2023 P1 Nishimura, Seiichi Yoshida)

April 10, 2023 Resor

Utflykter i Sverige, mest Stockholm.

• https://trippa.se/ (Trippa: Utflykter i Sverige)

Other things in Stockholm:

Andra nöjen i Stockholm

March 18, 2023 Astronomy

Comet C/2023 A3 C/2023 A3 Tsuchinshan-ATLAS, something to look for, October, 2024.

Maybe a really bright naked eye comet:

• http://www.aerith.net/ comet/ catalog/ 2023A3/ 2023A3.html
  (C/2023 A3 Tsuchinshab-ATLAS, Seiichi Yoshida)
• https://skyandtelescope.org/ astronomy-news/ observing-news/ anticipating-comet-tsuchinshan-atlas-c-2023-a3/
  (C/2023 A3 Tsuchinshan-ATLAS, Sky and Telescope)

Föredrag: (Stockholm, Sverige)

This is only for you who live in Stockholm, Sweden or want to travel and make a visit here.

De flesta av de här föredragen hålls i Stockholm. Vanligtvis är de på svenska men ibland på engelska. Läs noga på deras hemsida så att det inte blivit inställt eller flyttat.

Området är naturvetenskap.

2022 Visning / Föredrag

• Visningar av Alba Nova teleskopet:

  http://www.astro.su.se/ om-oss/ evenemang/ teleskopvisningar
  (Alba Nova teleskopet, Stockholms universitet)

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