Marco Gilardetti
Member
I have been given a russian 1000mm catadioptric lens which had been converted into a telescope by adding a rack-and-pinion focusing tube, a 45° prism and an eyepiece holder. I would like to use it, but it seems that it can't focus with any of the eyepieces that it came with. Apparently, a much longer tube would be needed, and the eyepiece should sit much more far away (like: half meter) from the barrel of the lens in order to see a focused image.
Does anyone perhaps own a similar gizmo, and can figure out or suggest what may be wrong? Is there any missing lens/part perhaps? I can hardly imagine anyone doing this conversion only to get an unusable bucket of metal and glass, I'm pretty sure that it had to be functional at the beginning.
As a side note, by searching over the internet I have spotted this neat conversion kit which apparently does the same thing. Unfortunately, as it can perhaps be seen in pictures, the conversion on my unit was done pretty roughly, by filing out the original 42mm thread before attaching the rack and pinion tube with screws.
https://www.adrianololli.com/articolo.asp?ID=2861
Any help is welcome. Thank you.
Does anyone perhaps own a similar gizmo, and can figure out or suggest what may be wrong? Is there any missing lens/part perhaps? I can hardly imagine anyone doing this conversion only to get an unusable bucket of metal and glass, I'm pretty sure that it had to be functional at the beginning.
As a side note, by searching over the internet I have spotted this neat conversion kit which apparently does the same thing. Unfortunately, as it can perhaps be seen in pictures, the conversion on my unit was done pretty roughly, by filing out the original 42mm thread before attaching the rack and pinion tube with screws.
https://www.adrianololli.com/articolo.asp?ID=2861
Any help is welcome. Thank you.