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About Astrofriend

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    Astronomy, Cars, old stuff
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  1. Hi Vlaiv Thanks a lot for all the details. When reading through this I got ideas why the plugins I have download lately doesn't work. I think there is some problem with the compilation of them. In the links/text you provided I found other compilators that I can use. When I get some sparetime later I shall down load these compilators and redo the Java run file. I'm not very used with Java so it take some time for me. Now I'm working with the photos I took with my Pentax 67 medium format lens at M45 nebula. Some clouds destroyed it for me but at least I got something to do analyze on. Again, thanks a lot! /Lars
  2. Astrofriend

    A medium format lens on a Canon full frame

    Hi, Last night we got a a clear sky, at least I thought so. My friend invited me to follow him out to a dark place outside the city. My plan was to test my medium format lens on a object that I also have taken photos of with my more modern APO lens. We started about 7 pm. We have winter now and it's dark already at this time. As usually we got clouds drifting in over us. Still we could doing some astrophotographing but not very high quality of the images. Anyway I have the photos here, both my old Pentax 67 medium format 165mm f/2.8 lens and the Sigma APO 150mm f/2.8 lens: http://www.astrofriend.eu/astronomy/my-astronomy-photo/open-clusters/m45-open-cluster.html The stars bleading over, the red and blue doesn't focus at the same place as the green wavelength as espected. The advantage of the old lens is that I can use it at f/2.8 compare to the APO which I set the aperture to f/4.0. I use these settings most to get the vignetting under control. But of course even the sharpness got better. What I miss most is the focus motor that I have in my Canon lenses. Now when get used to control the camera (Canon 6D) over the smartphone I have found it very convinient. One more thing I tested this evening was the new angled finder I bought to the Star Adventurer mount. What a difference, now I can place the polar star exact where I want it. Almost impossible to see throught the polar scope normally when living at +/-60 degree latitude. Even the red light lamp I have worked well. But need another holder for it. I will post more about this later on my homepage. /Lars
  3. Hi Vlaiv, Thanks a lot for the information and suggestions how to solve it. The matemathics is not the big problem, more how to implement it in AstroImageJ. I took a look at the PixInsight software, what I can see it works in a simular way that AstroImageJ do, but much more astro function friendly and there is also a lot of functions that I can use. But I like the open sourch software better. There is also Imagej2, but can't see many functions oriented to astronomy yet, maybe in the future, at least they are talking about ImageJ2 as a base for astronomy functions. Lets see how it develops, now I'm preparing to do some astrophotographing, without images, no image processing. Sorry to say, I'm living in a big city. /Lars
  4. When building mosaics and when doing very wide field photographing it could sometimes be useful to correct the optical distortion. I try to implement something in the software AstroImageJ were I can do it. There are some plugins but still a bit tricky to get it to work. It's a self learning project/tutorial for myself and maybe others also find it interesting. Here what I have written down so far: http://www.astrofriend.eu/astronomy/tutorials/tutorial-astroimagej-optical-distortion/tutorial-aij-01-optical-distortion.html It's slowly in progress. The last thing I have done this week is to find the parameters of the optic distortion, page II. i.e. find a, b and c r' = a*r + b*r^2 + c*r^3 ... Correction for rotation symmetric distortion. There are other software that can do this very easy I think, but I want to do it from the ground to learn more and have more control over it. /Lars
  5. Astrofriend

    Star Adventurer wedge modification

    Hi, I like the Berlebach 212 tripod. I see that they also have other shorter models. I don't need it to be very tall. I remote control my camera from smartphone and then I see the display whatever angle the camera is pointed to. The last modification of my setup I added an angle viewer to the polar scope. I don't want the tripod to be more then 18" tall when packed on travel. This is how I have my angled polarscope viewer setup: http://astrofriend.eu/astronomy/projects/project-star-adventurer-angled-viewfinder/project-star-adventurer-angled-viewfinder.html Thanks a lot for that information. /Lars
  6. Once again we travel South in Europe, this time we visit Lisbon. Never been in Portugal earlier so this travel was really exiting. Lot of old culture to see and tasty foods. Maybe a bit higher cost than expected but still cheaper compare to Sweden where I live. This time it was not only I and my girlfriend, we had also brought with us a friend. All three of us are interested in astronomy. When I know we should visit Lisbon I started to search for some astronomy related. I found that there is an old observatory just 6 km from where we stayed. They also had guided tours, but should be booked at least two weeks before visit. This was a last minute travel and not enough time left. Here is my mini report from Lisbon Astronomy Observatory: http://www.astrofriend.eu/astronomy/observatory-sites/lisbon-astronomical-observatory/lisbon-astronomical-observatory.html It didn't worked out as expected, but you at least have the information if you visit Lisbon in the future. /Lars
  7. Astrofriend

    Star Adventurer wedge modification

    Hi, Thanks for the link to the WO wedge, looks to be of good quality, but why doesnt SW reconstruct its own, it has been out there many years now. /Lars
  8. Astrofriend

    Star Adventurer wedge modification

    I have looked at speaker holders, the ones you set at the wall and hold the speakers. The lock mechanism is very good and stable. But miss the fine adjustment I need. I have also looked at wedges from other small telescopes, but no perfect one yet. Lars
  9. Astrofriend

    A medium format lens on a Canon full frame

    Hi Huw, It looks great! Ones I had the Pentacon SIX system with Carl Zeiss lenses: http://www.astrofriend.eu/astronomy/equipment/m42-and-other-lenses.html#part02 Sorry to say, there were never a chance to test them as astronomy lenses. /Lars
  10. Astrofriend

    A medium format lens on a Canon full frame

    I was very curious to test my medium format Pentax 67 lens on an astronomy object. I couldn't wait until I got a clear sky and performed this test at the balcony without polar align. Very light polluted sky. Here is the simple analyze I did: http://www.astrofriend.eu/astronomy/projects/project-pentax67-test/project-test-pentax67-lens.html I must say that it perform better than expected. It's a bit exiting with this medium format lens and I will later spend a night on some astronomy object at a place with darkness. /Lars
  11. Hi, Thanks for the equation, I will investigated deeper later. /Lars
  12. Long time ago I bought a Pentax medium format lens. It's a Pentax SMC 67 165 mm f/2.8. The reason I bought this was to have as low vignetting as possible. Later I bought the Sigma APO 150 mm f/2,8. Very good but a bit high vignetting. After this the Pentax have collected a lot of dust. But why not give it one more chance? Here you can see some graphs over the vignetting where I compare the Sigma with the Pentax: http://www.astrofriend.eu/astronomy/projects/project-sigma-pentax-vignetting/project-sigma-vs-pentax.html Later I shall also do some test how sharp it is, now with a live view camera it's much easier to get it in perfect focus, I think I failed with this earlier. Any other out there using medium format lenses (for astro)? /Lars
  13. I continue with my Star Adventurer experiments how to get the most out of it. I can notice when I taking 120 seconds exposures with my Star Adventurer mount and the 150 mm camera lens I sometimes get elonged stars. And with that long exposures also the brighter stars oversaturate. How will my equipment perform if I take more and shorter exposurers, can my Canon 6D handle that? It has relative low readout noise at higher ISO settings but limited dynamic range then. Here I have done two tests to compare: http://www.astrofriend.eu/astronomy/tutorials/tutorial-dynamics/tutorial-dynamics.html At least in this case I feel the camera can handle the shorter exposure and still have good dynamics. I live close to a big city, but I have found two places out in the east close to the coast where I have a relative dark sky. With my small ST I can easy go out there and doing astrophotographing. Almost all my earlier AP have been done with a very lightpolluted sky. /Lars
  14. Hi Rob, Thanks for the comments! It was really a great place for us who lives close to a big city. We have thoughts to rent a small house down there for a week. Then we could bring heaver equipment with us and doing astrophotographing. An 5" APO refractor with EQ6 mount and a fullframe camera will make difference. /Lars
  15. Astrofriend

    Star Adventurer mount repair, part two

    I continue to adapt my Star Adventurer to fit my needs better, compact and low weight. This time I modofied the L-bracket to let the camera be oriented more flexible: http://www.astrofriend.eu/astronomy/projects/project-star-adventurer-modify-lbracket/project-star-adventurer-modify-lbracket.html With this modification with the ball head I now don't need the counter balance weight anymore. /Lars

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