I have kind of strayed in a different direction. Hopefully it will wind up better than when I tried to make a canon fd lens to pk mount adapter out of a teleconverter, on the presumption I might get better glass than the Chinese ones. In reality I enjoy hacking and modding so that may be why I take on stupid projects like this.
#Ebay ripit full
In the mean time, I have apparently decided to go full bore stupid with this one (wasting money and tons of time and work on a project that may just fail). I really appreciate everyone input on some possibilities to keep an eye out for. I might even try an off brand one if the price is right. I have a feling it will be a long wait but I'm sure I'll eventually run across something (maybe the vivitar or if I score a deal on price the pentax). I'm continuing to look for a comercial one (I'm skeptical about the bower and its t mount so I cn only use it with my crappy 500mm, not my better lenses). Telescope optics are a lot more common including used compared these adapters so I'm thinking I could get decent optics for a lot less (unless I get lucky on ebay of course). So I'm going to keep looking for a premade one on ebay but I'm also thinking of building one with better optics and the star diagonal. The image was up side down and reversed but a star diagonal should fix that. In other words, I put the 500mm lens on a tripod, and with a camera zoomed in 4x (the live view zoom for better focusing), a licencing plate on a car filled about the same amount of the frame as it did with the 500mm lens and the adapter. The eye piece was 12.5mm and seemed to give the view of about 2000mm with a 500mm lens. Quality was what I expected from a really cheap plastic element eye piece but it was plenty usable. I had to use a 12mm macro tube to push it out a little further and it worked fine.
#Ebay ripit trial
I would glue it but this was just a trial run.
The lock ring that that held the elements push fit onto the first thread of the eye piece and seemed to hold it straight. I had to remove one more lock ring and all the elements came out. I had to loosen one lock ring, and the whole optical assembly screwed out of the teleconverter. I had a vivitar 2x teleconverter that was kind of trashed (came with a lens I bought), not to mention I have the same vivitar telconverter in good shape. 965" eye piece for $3 shipped off ebay missing the tube just to play with. This seems to be a less common specialty item that goes for a premium (unless you get lucky on ebay which I'll still try to do ). I have no idea about this one but other bower stuff I have had has been pretty budget quality.
Looking at the bower one, it really looks like a a slightly modified telescope eye piece and a star diagonal. I have been keeping an eye out for ones on ebay and I'm not finding much except a minolta one that seems a little more common.
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