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About Astrofriend

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    Star Forming

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    Astronomy, Cars, old stuff
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  1. Now at last, I could power up the EQ6 mount again. Really exiting to do this first test. One important thing was to setup the EQMOD with custom gear ratios, never done it before. It looks to work with the indoors test I did. Here it is: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/13-eq6-dismantling-rebuilding.html To my surprise the sound / noise was almost as high as before. Maybe others with standard spur gear has very high noise. I hope we get a clear sky soon so I can do real test. /Lars
  2. The mount is now assembled again and I can start to do some test and adjustings. I noticed that I had some friction when the clutches where open, didn't expect that. After some examination and test I found what happens in the mount and cause the friction. It's only when the cluthes are open I have friction. When closed and tracking it rotates with the two other roller bearings and then it's almost no friction. Good! Some photos from when I testing this: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/12-eq6-dismantling-rebuilding.html For me it had been better without these clutches, less complicated and more compact, save some kg also. If I ever build my own mount it shall not have any clutches and no gearboxes. It shall have direct driven 3-phases DC motors. For the moment only a dream. Until then I collect information: http://www.astrofriend.eu/links/links-astronomy-directdrivemount.html /Lars
  3. Today I have assembling more items on the EQ6 mount. I have measure the needed thickness of the RA and DEC shafts shims. I also checked if the length of the timing belts are correct, almost but have to do some modifications of the brackets for the stepper motors. Here is photo and info of todays work on the EQ6 mount: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/08-eq6-dismantling-rebuilding.html /Lars
  4. Hi, I was asked from another thread to put a photo of M31 taken with Star Adventurer and my Canon 300mm f/4 L lense on Canon 6D full frame camera. I don't think I can have the full resolution image here. Link to my homepage with the full resolution image: http://www.astrofriend.eu/astronomy/astronomy-photo/galaxies/m31/m31-galaxy.html This is my project page with the modifications I have done to my Star Adventurer: http://www.astrofriend.eu/astronomy/projects/astronomy-projects.html Scroll down and you find them. /Lars
  5. Hi, @oldeyes: I use AIJ (AstroImageJ) when doing the pre processing, later stage the Fitswork. I havn't done any advanced processing so the rings maybe come from compressing artefacts in the jpg file. I don't think PNG is better, but next time I update the image I can set a higher quailty when converting to jpg file format. When I'm looking on the full resolution image on my homepage I can't see the artifacts you describe, only on oversaturated stars, but they are always uggly. @Dave: But can I have a full resolution image at that place? I can place a link on that thread. /Lars
  6. Hi, I spend a day here to analyze my master flats and what vignetting I have on my lenses and telescopes. It's very simple done but still interesting to set figures on it. It's done on a full frame camera and I use the values from the center and the corner of the sensor. The corner is 22 mm of from the center on a full frame sensor. I never liked to have strong vignetting in my optics, and in the future I want to go for bigger size than full frame. I have put together a page over the vignetting I got: http://www.astrofriend.eu/astronomy/projects/project-different-lenses-vignetting/01-different-lenses-vignetting.html Maybe interesting for some of you to have a look at. My telescope shall handle a medium format sensor of the size 48 x 36 mm with the setup I have now. My medium format optics already do it. Just missing the medium format camera. /Lars
  7. At last, I could start assembling the EQ6 mount. This first step was easy, only installed the timing pulleys, the big one ocn the worm gear drive. Here it is: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/07-eq6-dismantling-rebuilding.html I will be busy with a star party the following days, after that I shall take next assembling, how to get the timing belt correct installed between the two timing pulleys. Looks very difficult. /Lars
  8. Hi Happy-kat, Thanks for the comment. I'm very positive surprised that it worked so well fully open (f/4) on a full frame sensor. Now in the beginning I will used it as it is, I tried to stop down one step but got very uggly result with strong spikes. Better as you say to have a circular stop in front of the lens. /Lars
  9. First light with Canon 300 mm lens f/4. At last we got some darkness so I could test my "new" Canon 300 mm f/4 lens. I used my Star Adventurer mount and didn't had very big expectations about the result. But it worked very well, this is nice, it's like a small telescope. Easy to bring with you on travel. No problem to adapt field flatter. Built in focus motor that I can remote control from my smartphone. See here: http://www.astrofriend.eu/astronomy/astronomy-photo/galaxies/m31/m31-galaxy.html It was a lot of things that went wrong this night, but I got 44 minutes of exposures. Next time, better polar align and better focus. At the bright stars there are some blue bleeding, I have seen that on other 300 mm lenses too. Maybe less when I focus it better. /Lars
  10. Hi, I live at 60 degree and the polarscope is not so easy to use. Now I have added a 90 degree finder. It's like a dream: http://www.astrofriend.eu/astronomy/projects/project-star-adventurer-angled-viewfinder/project-star-adventurer-angled-viewfinder.html Now I can easilly track with my 150 mm lens. Lately I bought a 300 mm lens, to get better tracking and more portable I have built a new tripod from a Manfrotto. Shorter legs, no centerpillar. http://www.astrofriend.eu/astronomy/projects/project-star-adventurer-tripod/01-project-star-adventurer-tripod.html I have also made some modification to the wedge to get it more stable: http://www.astrofriend.eu/astronomy/projects/project-star-adventurer-modify-wedge/project-star-adventurer-modify-wedge.html I have sometimes used a big ballhead, but to weak in combination with the 300 mm lens. I will built something else to replace it later. Maybe something I can do with the 3D printer I have ordered. /Lars
  11. Now it's time for an update of my timing belt project. From the beginning I was not convinced that I should modify my EQ6 mount and replacing the spur gears with timing belts. But I do now. I needed some tools and machines. I looked for a used desktop lathe but couldn't find any and the time goes on. Later a new friend offer to me to use his lathe, perfect, maybe I can be finished in time and some test later when the darkness comes back. You can read here what I have done, also added a lot of photos to make it easier to follow: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/06-eq6-dismantling-rebuilding.html I can not recommend any to do this, better to buy a ready made kit that is just to mount. I feel it's more exiting to do things myself, maybe a sickness. It will be very interesting to see if I get any advanteges of using a wider 6 mm belt for more stiffness and the GT2 profile pulleys that they use in 3D printers to reduce the backlash. /Lars
  12. Hi, I have made a test where I replaced the plastic shims with steel shims. Looks to make the wedge must more stable. http://www.astrofriend.eu/astronomy/projects/project-star-adventurer-modify-wedge/project-star-adventurer-modify-wedge.html Now I just have to find steel shims that are a bit smaller then the shims I used to do this test. /Lars
  13. It's always so much to do, but this weekend I got some time to work on my EQ6 mount. I have removed the paint on the surfaces of the lids that cover the worm gear. You can follow the work here: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/05-eq6-dismantling-rebuilding.html I have also got the steel shims I ordered, but only got half of the number I ordered. /Lars
  14. Yes, it was not space enough for a sphere inside the building, maybe version 3. But anyway it gives a respecfull view of the scale when you scale our solar system to a whole country. These small balls with all space between them. /Lars
  15. You just like me can probably feel that some days feel boring. How to remedy this? Well you can go and listen to different seminars, here are two that I listened to recently. It is about spectra from stars and exoplanets. I made some notes and took some photos: http://www.astrofriend.eu/astronomy/astronomy-articles/spectra-exoplanets-stars/spectra-exoplanets-stars.html Hope you can find something similar in your locality where you live. /Lars
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