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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 native language, so don't judge me too hard if you find grammatical errors and more.

Welcome to my home !

Astrofriend's homepage

Since 2002

Highlights!

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

Contents (last update):

January 1, 2026 High lights on Astrofriend's homepage
December 27, 2025 All News on Astrofriend's homepage
January, 2026 Astrophoto database latest astrophotos
October 5, 2025 Great comets coming in the future
January 12, 2026 New links with interesting information
December 4, 2025 Speech, Events and articles (English/Swedish)

High Lights:

Here I have collected extra news about my travels, astronomy, cars, history etc. For a more complete list, se above: All News.

2026
January 1, 2026 Astronomy: Project I have ordered a duo 7 nm narrow band filter and to make it fit I have to make some adapters between camera and lens/telescope: astronomy/ projects/ project-ts130-nikon/ 01-project-ts130-nikon.html (TS130 refractor to Nikon D800) Update: One more mask added, page 9 Ray trace analyze, page 11 Prism bracket, page 10 Adapter guide camera, page 8 Aberration analyze, page 5 Other astronomy projects	$TS130 refractor to Nikon D800 adapter$
2025
December 27, 2025 Astronomy: Tutorial Test of TS flat panel, my astro friend Rolf lend me his flat panel so that I could do some test on it and compare the quality of my own DIY flat panel: astronomy/ tutorials/ tutorial-gimp-astrophotography/ 07-tutorial-flatcalibration.html (TS flat panel test) Other astronomy tutorials
December 25, 2025 Astronomy: Project Dry stains on the camera's sensor is a big problem. Here I do an experiment to heat the camera body when taking it indoors: astronomy/ projects/ project-heating-band/ 05-project-heating-band.html (Dry stains on the camera's sensor) More Other astronomy projects
December 19, 2025 Astronomy: Tutorials GIMP in 32-bit version can handle high contrast images as we have in astroimages. A common problem when processing astrophotos is how to handle nebulas and stars high contrast: astronomy/ tutorials/ tutorial-gimp-astrophotography/ 00-tutorial-gimp-astrophotography-monitor-calibration.html (Gimp: Tutorial for astroimage processing) Update: Monitor calibration, page 0.0 Other astronomy tutorials
December 18, 2025 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: Post processing, page 9 Other astronomy tutorials
December 9, 2025 Photography: Scanner Have you got a lot of Kodak Instamatic film negative from your parents? It's not so easy to scan this 126 film format. Here I take a look at it if I can modify my Epson scanner to do it: photography/ scanner/ epson-4180/ epson-4180.html (Epson 4180 scanner, Kodak Instamatic 126 film) Other Photography
7:e december, 2025 Fysik Nu har Julföredraget varit och det var roligt och spännande som alltid. Jag tog några foton så ni som inte kunde delta kan se vad som visades. astronomy/ astronomy-articles/ physics-show-2025/ physics-show-2025-sv.html Uppdaterad med länkar till filminspelningen av föredraget. Andra reportage om föreläsningar
October 20, 2025 Astronomy: Project I have used my push pull focuser two years now and it has worked almost perfect. Can it be more developed and simplified ? astronomy/ projects/ project-focus-pushpull/ 05-project-focus-pushpull (Simplified push pull focuser) Other astronomy projects

September 29, 2025 Astronomy: Project I have updated this project page with KStars 64-bit setting for the ZWO ASI120 USB2 camera: astronomy/ projects/ project-asi120mm-upgrade/ 01-project-asi120mm-upgrade.html (ZWO ASI120 USB2 upgrade) Other astronomy projects
24:e september, 2025 Historia, Nya Slussen byggs upp Södermalmstorg får träd. history/sverige-stockholm-slussen/ sverige-stockholm-slussen-start.html (Södermalmstorg får träd, Stockholm) Senaste Slussen promenad längst ned på sidan. Andra platser om Sveriges historia
23:e september, 2025 Astronomi, Historier Jag åker med Rolf ut till Tyresta för astrofotografering. Rolf fotar galaxhopar medans jag gör en timelapse i området runt polstjärnan: astronomy/ astronomy-stories/ astrofriend-night-diaries/ astrofriend-night-diary-20250923-se.html (Timelapse i Tyresta, september 2025) Andra astronomihistorier
14:e september, 2025 Historia, Stockholm Med fint väder i början på september ger vi oss ut till Beckholmen vid Djurgården. Vi ska lyssna på ett föredrag om segelfartyg. Här finns också bilder från år 2005 som jämförelse: history/ stockholm-beckholmen/ 01-stockholm-beckholmen.html (En promenad på Beckholmen, Djurgården) Andra platser i Stockholm med historia
September 4, 2025 Travel Sweden A cruise to Ystad and Visby in Sweden, 2025: travel/ sweden/ ystad-visby-2025/ 01-ystad-visby.html (Southern and East of Sweden, 2025) Other travels in Sweden
August 28, 2025 Home Theatre Now retired and I'm in need of new toys. Some upgrades of the Home Theatre system. 4K player, PC, Xbox. sound-image/ home-theatre-resurrection/ home-theatre-resurrection.html (Home Theatre resurrection, 2019-2025) Other Sound and Image
18:e augusti, 2025 Historia, Stockholm Följ med oss i bilder från vår promenad runt Södermalm. Här håller vi oss i trakterna av östra Mariaberget: history/ stockholm-promenad-mariaberget/ 01-stockholm-promenad-mariaberget.html (Från Mariatorget till Timmermansgatan) Andra platser i Stockholm med historia
August 2, 2025 Astronomy, Impact structures (meteorite craters) In July we took a trip to Northern Sweden, among other things we visited the impact structures Siljansringen and Dellen, old meteorite craters: astronomy/ meteorite-craters/ impacts.html (Impact structures, 2025) Other meteorite craters
June 28, 2025 Astronomy, observatory sites Slottsskog's observatory, Sweden 2025: During a visit to Gothenburg we visited Slottskogen's observatory: astronomy/ observatory-sites/ slottsskogs-obervatory/ slottsskogs-observatory.html (Slottsskog's observatory, Gothenburg, Sweden 2025) Other observatory sites
20:e maj, 2025 Historia, Älvsjö Jag är uppväxt med Stockholmsmässan och nu planerar de att riva den. Jag ger mig iväg med kameran för att ha några minnen från den: history/ alvsjo-stockholmsmassan/ alvsjo-stockholmsmassan-sv.html (Stockholmsmässan i Älvsjö) Andra platser i Sverige med historia

26:e april, 2025 Astronomi, Historier Långt fram i april är det inte speciellt mörkt på nätterna. Men jag har inte avslutat astronomisäsongen än. Kometen C/2025 F2 Swan är uppe på himlen och just ikväll råkar det vara klart väder: astronomy/ astronomy-stories/ astrofriend-night-diaries/ astrofriend-night-diary-20250426-se.html (Kometen C/2025 F2 Swan, april 2025) Andra astronomihistorier
April 6, 2025 Travel Europe Our visit at Mallorca in Spain, 2025: travel/ europe/ spain-mallorca-2025/ 01-mallorca.html (Mallorca, Spain 2025) Other travels in Europe
March 29, 2025 Astronomy: Solar eclipse On March 29, 2025 we got a partial solar eclipse in Stockholm: astronomy/ astronomy-photo/ solar-system/ sun/ solar-eclipse-2025/ solar-eclipse-2025.html (Solar eclipse 2025, Stockholm) Other astronomy photography
March 4, 2025 Music lists Update of my favorite music artists, music lists on YouTube: sound-image/ song-music-favorites/ favorite-music-list.html (Music lists) Other Sound and Image
February 19, 2025 Astronomy: Project Do you also have these black holes on your camera's sensor ? It could be dust but in this case it's dryer stains. After I had clean the sensor it's okay, but only one night outdoors and I get a couple of new stains, very frustrating. Here I do an attempt to avoid to get new stains: astronomy/ projects/ project-dew-sensor/ 01-dew-sensor.html (Dryer stains on the camera sensor) Other astronomy projects
2024
December 15, 2024 Sound, Music A streamer for music must be good to have. A bit expensive but can easily be built around a Raspberry: sound-image/ raspberry-musicstreamer/ raspberry-musicstreamer.html (Raspberry Music Streamer) Other Sound and Image
August 24, 2024 Astronomy: 3D-printing Project I have sometimes used my polar finder scope when aiming for the polar star. To make it easier I use a right angle prism. To fit that right angle prism to the polar telescope I 3D-printed an adapter I found on www, it worked but a bit wobbly, it could be better. Now I have designed my own adapter which is more stable: 3d-printing/ 90degree-polarfinder-adapter/ 03-90degree-polarfinder-adapter.html (Project: 3D-printed right angle adapter EQ6/HEQ5 mount) Other 3D-printing projects
18:e augusti, 2024 Historia, Stockholm Göta Landsväg, landsvägen till och från Stockholm har en tusenårig historia på vissa platser. Här är början på den, från Skanstull till Södertälje: history/ stockholm-gota-landsvag/ 01-skanstull-en.html (Göta Landsväg i Stockholm) Uppdateringar med fotografier på sträckan Årsta till Liseberg, sidorna 3 till 6. Andra platser om Sveriges historia
July 4, 2024 Car meetings Today we visited a car meeting in Trosa and we went there with Ivan and his Chrysler 300: vehicles/ trosa-ivan-2024/ trosa-ivan-2024.html (Trosa car meeting, 2024) Other car meetings in Sweden
9:e juni, 2024 Historia, Fornborgar Idag bestämmer vi oss för att ge oss ut i naturen. I Kagghamara söder om Stockholm skall finnas ett par mäktiga fornborgar, dit åker vi: history/ sverige-fornborgar/ kagghamra/ sverige-kagghamra-fornborg-1.html (Kagghamra Fornborgar i södra Stockholm, 2024) Andra platser om Sveriges historia

May 17, 2024 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
May 3, 2024 Photography: Macro Long time ago I built a macro setup. Never used it much but now I built version 2 of it, a better working one: photography/ macro-photography/ macro-slider-v2/ macro-slider-v2.html (Macro photography, slider setup v2) Other Photography
March 29, 2024 Astronomy: Astrophotos After all years my hard drives get full of astro photos, especially them who contain time lapse videos. What to do with them ? I collected all these time lapse videos in a nostalgic tour in Astro time lapse videos: astronomy/ astronomy-photo/ time-lapse/ time-lapse-slideshow.html (Star shows and Time Lapse videos) Other astronomy photos
March 27, 2024 Photography: Slide shows Updated my page with slide shows, most from Stockholm: photography/ slideshows/ photography-slideshows.html (Slide shows, mostly from Stockholm) Other Photography
20:e mars, 2024 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) Other history related
February 11, 2024 Technique Our NAS server aging. It has to be replaced by something new. I have read a lot of positive comments about setup a Raspberry as a NAS. It has low power consumption which is good with the increased energy prices we have today: technique/ raspberry-nas/ 01-raspberry-nas.html (Raspberry NAS) Other about Techniques
January 15, 2024 Astronomy: Astronomy Project I noticed that my old EQ6 project has a lot of visitors. And of course, it's about rebuilding it to belt drive. I have looked through the pages, updated it. Some of the pages has moved to separate project and tutorial pages. Some error in info and misspellings corrected too: astronomy/ projects/ project-eq6-dismantling-rebuilding/ 01-eq6-dismantling-rebuilding.html (Project: EQ6 Dismantling and rebuilding for belt drive) Other astronomy projects
11 januari, 2024 Nöjen i Stockholm Restauranger: Här finns listat några restauranger som vi brukar besöka. God mat och hyfsade priser. Nytt är också en lista på restauranger som har pensionärs rabatter. Har inte hunnit besöka dessa själv än: pleasure/ restauranger/ restauranger.html (Listor och kartor över restauranger i Stockholm) Andra nöjen i Stockholm
11 januari, 2024 Nöjen i Stockholm Takpubar: Kompletterad med några takpubar till. Sommarens projekt blir att besöka några av Stockholms takpubar. 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 i Stockholm
2023
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

2022

December 7, 2022 Astronomy, solar eclipse history The Solar eclipse 1954 in Sweden: 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: 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
August 21, 2022 Boats / Monalisa Stefan has sent me even more photos of his renovation of his boat Ellinor, it's a sister boat to my father's Monalisa: vehicles/ everts-cruiser-monalisa/ everts-cruiser-monalisa.html (Mahogany cruiser Monalisa) Other ships and boats
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
2022
28 mars, 2022 Mörka observationsplatser: Astronomi Örudden på Torö. I södra Stockholm på ön Torö är man långt från stadens ljus. Här är några foton från en parkering i naturreservatet: astronomy/ observationsplatser/ orudden/ observationsplats-orudden.html (Observationsplatser Örudden Torö, Stockholm) Andra observationsplatser i Stockholm All other news: News.
2021
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 of the 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
January 9, 2021 3D CAD In this project I make drawings for GT2 pulleys that I will use in my lens focuser's construction: 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
2020
29 juli, 2020 Hobby När jag var omkring 9 år köpte min pappa mig min första modellbåt i trä, båten Flamingo från Wentzels. 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
2019
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
27 januari, 2019 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

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