Gábor Ember Posted September 23, 2013 Author Share Posted September 23, 2013 I read about decentering and tilting errors and it certainly looks like the SUN has some tilting error. I read an article on Lensrentals blog about testing this. I will probably shoot some test pictures in the evening and check if the error is caused by the front or the back part and also if it is inside the glass group, or the whole group is tilted. We can counteract any tilt and shift errors in the machining process hopefully. Link to comment Share on other sites More sharing options...
Gábor Ember Posted September 26, 2013 Author Share Posted September 26, 2013 OK new stuff. I need to design two sockets for the front and back glass block of the SUN. The original housing for the front glass does not enable proper alignment, it loosens the whole group which can rotate even from cleaning with a cloth. I need to create a tube that holds the glass in position with probably O-rings and a threaded ring that tightens, fixes the glass in place. Now this tube has to be aligned (only once). I am now at 10 parts for the design. It is way more than what I first wanted but they are much more simple. I really need to post some pics of what I am talking about... Edit.: Since I will place the SUN back glass really close to the helios I may be able to eliminate vignetting. Can anyone suggest a light helical grease? I will need to grease the parts but I don't want to make the focusing really heavy. Matthias Malleši� 1 Link to comment Share on other sites More sharing options...
Gábor Ember Posted November 26, 2013 Author Share Posted November 26, 2013 A finnally got around to start actual CAD work, still pretty noob at it. I don't know how to make threads but the sizes are accurate. Sun front, Sun back, Helios block Slot for the Sun back lens that sits right on the front of the Helios block Ring that holds the Sun back lens in the slot (similar to the original design, except now it is on the front side of it) I still don't know if white lithium grease would be good as helical grease for this build. Also I am thinking of screwing a M42 to EF adapter to the back of the lens tube with 3 screws. Would this be a good idea or is it better to find a broken Canon EF lens and use its mount instead? Matthias Malleši� 1 Link to comment Share on other sites More sharing options...
Chris Elkerton Posted November 30, 2013 Share Posted November 30, 2013 Really interesting project Gabor, how are you getting on with it? Link to comment Share on other sites More sharing options...
Gábor Ember Posted November 30, 2013 Author Share Posted November 30, 2013 I am still designing the housing. I have some problems with the aperture setup, I don't yet know how to implement it to be really sturdy. I can probably finish the design next month (I mean not just the design but the measured CADs) then my friend (if he is willing) can make it in a few weeks. These part that I posted should be the first, then the full tube that holds the lenses. After these I need to measure the correct focusing distances and make the helicoids according to this. The last ones will be the focus (and maybe aperture) rings. Link to comment Share on other sites More sharing options...
Chris Elkerton Posted November 30, 2013 Share Posted November 30, 2013 Cool. You should do a making of video, it would be really good to see it all come together. Link to comment Share on other sites More sharing options...
Gábor Ember Posted November 30, 2013 Author Share Posted November 30, 2013 I want to do it once we get there :) Link to comment Share on other sites More sharing options...
Gábor Ember Posted December 2, 2013 Author Share Posted December 2, 2013 Yesterday I talked briefly with my friend and he said that he can't do nonlinear helicals (doesn't have the equipment) so single focus is out. We are probably going to use threads instead of grooves for focusing (like on the original lenses) but with matching focus ring rotation (same angle and direction from min. focus to max). Link to comment Share on other sites More sharing options...
nazdar Posted December 2, 2013 Share Posted December 2, 2013 Interesting. Link to comment Share on other sites More sharing options...
valid Posted February 26, 2014 Share Posted February 26, 2014 Great project - how are you getting on? Link to comment Share on other sites More sharing options...
Gábor Ember Posted February 26, 2014 Author Share Posted February 26, 2014 Thank you, well the project is on pause. I am currently transitioning to Micro 4/3, I bought a GF1 and I am testing the lenses on it. Link to comment Share on other sites More sharing options...
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