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December 1, 2022

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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.

Welcome to my home !

Astrofriend's homepage

Since 2002

Celebrating 20 years !


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



Here I have collected news I found interesting.

Technology, Astronomy, Cars, Travels etc.

December 1, 2022 Cars, Chrysler Crossfire:

Installation of new springs, bushings and rubber pad

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: Rear bushings

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:

Projects: Medium format off-axis adapter 3D CAD

November 19, 2022 Astronomy, observatory sites

2021 we visited Kvistaberg's and Tamm's observatories and took outdoors photos. Now we got the opportunity to come inside and see the big Schmidt Cassegrain telescope, see page 1b:

 Kvistaberg's and Tamm's Observatories:

Interior with the Schmidt Cassegrain telescope

Other observatory sites:

Tamm's observatory, 2022

November 20, 2022 Astronomy: Project

  • I have now used my compact mount which is based on the Sky Watcher HEQ5. It work very well and I can now adjust some small detail to be perfect. My first bracket for the camera system is a bit weak and I have now designed a new one. More support make it stiffer, new holes to attach more equipment:

    astronomy/ projects/ project-heq5/ 19-heq5.html
    (Project: HEQ5)

Practical knobs and Brackets, page 20

Other astronomy projects:

Projects: HEQ5 as a portable mount

November 12, 2022 Sweden Astronomi, Historier

Andra astronomihistorier:

En natt på Björnöreservatet fotandes nebulosor, 2022

November 7, 2022 Astronomy, observatory sites

The last observatory we visited in Croatia was the Rijeka Observatory. They find it very interesting and guided us around in the observatory:

Rijeka Observatory:

Added historical photos

Other observatory sites:

Rijeka Observatory, 2022

November 7, 2022 Astronomy, observatory sites

Earlier I visited the Uppsala old Observatory. I could only see them from outdoors. Now my friend Christoffer have sent me some photos of the interior with the old telescopes:

Uppsala old Observatory:

Other observatory sites:

Uppsala old Observatory

November 4, 2022 Travel Europe

All days are written now

Other travels in Europe:

Croatia Podgora, 2022

October 25, 2022 Astronomy, solar eclipse

When I sitting here and working Gunilla remind me that there is a partial solar eclipse today. Lot of clouds, we go out on the balcony and look if there are any opening in the clouds. We were lucky and got some glimpse of the solar eclipse. Lazy this time and only used the smartphone:

Partial Solar eclipse 2022, Sweden:

Other Solar system objects:

Partial solar eclipse, Sweden 2022

October 25, 2022 Cars, Chrysler Crossfire:

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: Battery drain and alarm siren

October 25, 2022 Cars, Chrysler Crossfire:

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: Blocked drainage

October 19, 2022 Astronomy, observatory sites

On our latest travel in Europe in Croatia we got a lot of astronomy related things to see. Second out is the Naval Observatory in Pula:

Pula Naval Observatory:

Other observatory sites:

Pula Naval Observatory, 2022

October 18, 2022 Astronomy, observatory sites

On our latest travel in Europe in Croatia we got a lot of astronomy related things to see. First out, the street astronomer in Rovinj:

Street astronomer in Rovinj:

Other observatory sites:

Street astronomer Josip in Rivonj, 2022

October 21, 2022 Astronomy, solar eclipse history

I found earlier a documentary film of the 1914 years solar eclipse. Now I have analyzed the film and done some comments and a simulation of it:

The Solar eclipse 1914:

My friends memories from the solar eclipse 1954 (at bottom of page)
Complementary information to the solar eclipse

Other Solar system objects:

Solar eclipse 1914

September 29, 2022 Astronomy, observatory sites

I found some very old drawings of the Stockholm's old Observatory which I have included in my and Nippe's article:

Stockholm old Observatory:

Other observatory sites:

Stockholm old Observatory

September 27, 2022 Astronomy, observatory sites

In September it was the Astronomy Day in Sweden. We visited the observatory at Saltsjöbaden which had Open House. Follow us on these two guided tours we joined:

Stockholm "New" Observatory:

Other observatory sites:

Stockholm New Observatory

September 23, 2022 Sweden Astronomi, Historier

Andra astronomihistorier:

En kväll på Björnöreservatet

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:

Sonab 2212

September 6, 2022 Travel Europe

All days of travel report finished.

Other travels in Europe:

By train in Northern Germany, 2022

28 augusti, 2022 Sweden Nöjen i Stockholm


  • Tidigare tipsade jag om takpubar och restauranger, mycket trevligt men inte billigt. Nu har jag kompletterat med en lista på restauranger där man kan äta god mat utan att det kostar väldigt mycket:

    pleasure/ restauranger/ restauranger.html
    (Listor över restauranger i Stockholm med god mat och överkomliga priser)

Restauranglista uppdaterad.

Andra nöjen: Nöjen i Stockholm

Restauranger i Stocklm med god mat och överkomliga priser

August 21, 2022 Boats / Monalisa

Other ships and boats:

Evert's mahogany cruiser Monalisa

August 21, 2022 Travel Gotland in Sweden

  • It's summer now and then we travel around in Sweden. This time we visit the beautiful island Gotland. I have been at that island three times before, but always exiting. My girlfriend has a special mission, she wants to find traces of her ancestors:

    travel/ sweden/ gotland-2022/ 01-gotland-2022.html
    (Visiting the island Gotland in Sweden, 2022)

    All days completed.

Other travels in Sweden:

Visiting the island Gotland, 2022

29 juli, 2022 Sweden 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:

Västra Stambanan,i Stockholm

July 7, 2022 Home Theatre

Other Sound and Image:

Hitachi remote repair

6 juli, 2022 Sweden Historia, Galgbackar

Andra saker om Sveriges historia:

Avrättning och galgplatser i Stockholm

July 4, 2022 3D printer

Other 3D Printer and CAD projects:

3D design, IGF Copenhagen gas owen knob with scale

June 3, 2022 Astronomy: Astronomy Project

Tools for develop, page 2

Other astronomy projects:

Stepper motor driver

June 3, 2022 Astronomy: Astronomy Project

Installation of timing belt, page 15
Assembling the parts, page 14
Installing focuser drawing tube's roller bearings, page 13
Stabilization of the focuser draw tube, page 13
New design with push pull screws, page 12
3D-printing the focuser chassi, page 10
Second design of focus chassi, page 10
Worm gear, page 11
More details added to the new focus chassi, page 9 to 10
Test print module 0.5 mm and 1.0 mm gears
Open the focuser and look how to implement the rack & pinion

Other astronomy projects:

3" focuser: 3D-Printing rack & pinion gears Old design

3" focuser: 3D-Printing rack & pinion gears New design

June 2, 2022 Travel Sweden

Other travels in Sweden:

From Stockholm City to Nynäshamn by steam train, from 2005 to 2009den 2021

May 9, 2022 Cars, Chrysler Crossfire lights:

  • By accident I destroyed my turn signal on the fender. When I searched for a new I found there where no ones to find, new or used. I repaired the old but later I must have a better solution. Here I design a 3D-printed adapter to mount more modern E certified turn signals:

    vehicles/ my-cars/ chrysler-crossfire/ turn-signals/ 01-turn-signals.html"
    (Turn signals)

    STL file download, page 4 bottom

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: Turn signal adapter 3D-printed

30 april, 2022 Sweden 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

TAK, takpub i Stockholm

April 22, 2022 Cars, Chrysler Crossfire lights:

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: License plate light

7 april, 2022 Sweden 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)

Film från Hamburg hamn år 1938, se M/S Canton när Hamburg hamn angörs
Krister har kommit med ny information om Violett
Sjömansrulla för fartyget S/S Baltia
Sjömansrulla för fartyget S/S Caring
Sjömansrulla för fartyget S/S Masilia
Interiörbilder från Engelsbergsarkivet av fartyget M/S Axel Johnson III
Sjömansrulla för fartyget S/S Torsa
Sjömansrulla för fartyget S/S Maria Gorthon

Other history related:

My father's adventures at sea, 1937 - 1945

April 2, 2022 3D printer

Other 3D Printer and CAD projects:

3D printer, assembling and setup

28 mars, 2022 Sweden

Mörka observationsplatser: Astronomi

Andra observationsplatser i Stockholm:

All other news: News.

Observationsplats Örudden på Torö

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:

It's no 10 on the map.

other meteorite craters:

Meteorite craters, Västra Styran Sweden, 2022

Mars 25, 2022 Cars, Chrysler Crossfire wheels/tires:

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: New rear Wheels and tires

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:

Projects: HEQ5 as a portable mount

Mars 13, 2022 Astronomy: Project

HEQ5 mount on pier (page 6)

Other astronomy projects:

Projects: Adapt pier to HEQ5 mount

Mars 10, 2022 Astronomy: Tutorial

Other astronomy tutorials:

Tutorial: Cleaning the camera sensor

Mars 4, 2022 Sweden Astronomi, Historier

Andra astronomihistorier:

Två nätter på piskbalkongen

January 29, 2022 Astronomy: Project

Setup Raspberry as a Hotspot (page 11)
Offset the focus position (page 8 bottom)
Adding a GPS receiver.
First Light.

Other astronomy projects:

Raspberry Pi4 as an astroserver

January 28, 2022 Astronomy: Project

Other astronomy projects:

Projects: Lithium battery power

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:

Other stars:

Seven stars in constellation Big Dipper, credit CdC

January 7, 2022 Astronomy, comet

The comet Atlas C/2019 L3:

Other comets:

Comet C/2019 L3 Atlas, 2022

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:

Ekos sequencer

January 11, 2022 Astronomy: Lens data base

Added Canon 75-300 III
Added Yongnuo 50mm f/1.8
Added Tamron 28-300 mm lens

Other astronomy tutorials:

Data base: Lenses with focus motor that works for astrophotolens

December 30, 2021 Astronomy, photography

With my new equipment I'm ready to take new astrophotos. With a 300 mm lens it's on the limit to be called a wide angle image:

Other Nebulas:

M42 Orion nebula, 2021

November 14, 2021 Sweden Historia, Nya Slussen byggs upp

Andra saker om Sveriges historia:

Karl Johan Slussen i Stockholm

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:


August 15, 2021 Travel Sweden

Other travels in Sweden:

Höga Kusten, Sweden 2021

June 12, 2021 Astronomy: Project

  • After I had rebuilding my EQ6 mount to timing belt drive I could do some test the last winter. Most worked as expected, but the internal stepper motor driver has some problem. There is a bug in the driver, EQMOD has implemented the RA drift compensating to handle this. With my custom gear ratio it was on the limit to handle it. But one thing that is more difficult to handle is that when running Raspberry with EQMOD INDI it's not possible to have a custom gear ratio. I can alter the driver because it's an open source, but better to change the stepper motor driver and get rid of the bug. I have started to implement the AstroEQ driver:

    astronomy/ projects/ project-eq6-dismantling-rebuilding/ 20-eq6-dismantling-rebuilding.html
    (Project: EQ6 dismantling and rebuilding)

Other astronomy projects:

Projects: HEQ5 as a portable mount

April 15, 2021 Astronomy: Project

Mount and pier
Welding in aluminum
3D-printed focuser

Other astronomy projects:

Lars B's projects

April 3, 2021 3D-printing: CAD

Other about 3D-printing and CAD:

3D CAD: Viewfinder cover, Canon EOS DSLR (6D)

Mars 23, 2021 Astronomy

prof Gösta Gahm

Gösta Gahm, 1942 - 2020 professor emeritus of astronomy

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

February 1, 2021 Astronomy: Project

Other astronomy projects:

Project: dew heater

29 januari, 2021 Sweden Resor till sjöss

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

Other history related:

Fartyget S/S Sylvia

January 9, 2021 3D CAD

New 180 teeth GT2 Pulley.

Other 3D Printer and CAD projects:

3D CAD: making drawings for GT2 pulleyes to lens focuserder

15 november, 2020 Sweden

Befästningslinjen Södra fronten: Svensk historia

Sjötorpsfortet tillagt.
Sundbyfortet tillagt.
Måndalsfortet tillagt, det sista fortet på denna försvarslinje.

Annan historia relaterad till Sverige:

Befästningslinjen Södra Fronten

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:

Even more objects

Other meteor showers:

Perseids meteor shower, 2020

29 juli, 2020 Sweden

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)

Har lagt till en lista på de modeller jag byggde, båtar, bil, flygplan.

Andra båtar i full skala:

Modellbåten Flamingo från Wentzels

June 12, 2020 Cars

Other car meetings:

Car meeting, The Nut House, 2020

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)

    More details about HTPC setup and MPC.
    Test with a Raspberry Pi4 as a HTPC.

Other Sound and Image:

Home Theatre resurrection, 2019

April 25, 2020 Astronomy: Tutorial

Subtraction of background.
Added align R, G, B layer.
Separating stars and DSO.
Separating stars and DSO, alternative.
Correct image for Vignetting.

Other astronomy tutorials:

Tutorial: Gimp for astrophotography

January 10, 2020 Astronomy: Tutorial

Have you ever got the experience that your raw astrophotos are in portrait orientation and your software needs them to be in landscape orientation ? This tutorial is about a fix to that problem.

Other astronomy tutorials:

Tutorial: How to rotate raw-files

January 1, 2020 Astronomy

  • What is it with our weather ? Clouds and rain every night. The motivation for all amateur astronomers go deep in the ground.

    The last days I have spent on the Gaia space satellite. It's a astrometry observatory with extremely high precision. Could it be used to do something interesting ? I have collected some information here and a simple test by me to start with:

    astronomy/ science-data/ science-data-gaia.html
    (Gaia data archive)

    You can use it as a tutorial how to use the Gaia data.

Other astronomy science data archives:

Gaia data archive

December 12, 2019 Astronomy, calculation

Other astronomy calculations:

Frank Drake's Equation calculator

November 8, 2019 Astronomy / seminar

Other speech, seminar and articles:

Seminar: How does the galaxy cluster environment affect molecular gas and starformation ? by Nikki Zabel

July 3, 2019 Travel, walks with old and new photos

  • One old idea I have is to take old photos and then take new ones from the same place and compare. I have started with the island Riddarholmen in Stockholm. The old photography is from the 19th century. Much more complicated then I first thought, it will take long time, here is the beginning of the work:

    travel/ sweden/ old-and-new-photographs/ introduction-old-and-new-photographs.html
    (Old and new photography from Stockholm)

Other things about Swedish history:

Old and new photography from Stockholm

May 19, 2019 Sound / Image

Other things about sound and cinema:

Biograf (Cinema) Sländan Museum, 2019

27 januari, 2019 Sweden

Nya kartor över fornlämningar: Fornhistoria

Other history related in Sweden:

All other news: News.

Gånggrift Hallarör i Västergötland
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New links:

Here I have collected new links that I found interesting.

Technology, Astronomy, Cars, Travels etc.

Mars 16, 2022 Astronomy, lens

Japan must have looked at my site, they are now sending a Pentax 300 mm f/4 lens to space. I use an older variant in my 300 mm project.

Pentax 645 300 ED IF f/4

Mars 12, 2022 3D-Printing, Astronomy

Found this Batinov mask generator, I have never test it but looks interesting.


February 21, 2022 Mechanical ideas

Found this YouTube video when I search for information. He do a deep in analyze of auto guiding in combination with different telescopes.


February 9, 2022 Mechanical ideas

Maybe something that can give you ideas how to construct details with your 3D-Printer.


12 January, 2022 Historia Sverige Sweden

Om du är intresserad av svensk historia och bor på östkusten är denna dokumentär riktigt intressand för dig. Handlar om Ryssarnas härjningar på svenska östkusten år 1719:


January 12, 2022 Astronomy Smart Telescope

You maybe only do visual observations because you feel it's too complicated to do astrophotographing. Then this instructions video could be of interest for you, or just because Lazy Geek do a lot of nice videos in the Astronomy area. Have one hour of pleasure !


Mars 10, 2021 Travel and Astronomy

Astro-tourism, a growing tourist travel area.

Andromeda M31 POSS-I

December 8, 2020 Astronomy education


Overview of the links:

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Must do stuff:

Technology, Astronomy, Cars, Travels etc.

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

November, 2022 Astronomy

Comet C/2022 E3 ZTF:

Comet C/2022 E3 ZTF Star Chart from: CdC
Seiichi Yoshida's home page

Mars, 2022 Astronomy

Comets to view 2022:

Sky and Telescope
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Föredrag: (Stockholm, Sverige) Sweden

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

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