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I know its late to post.
I have used Nikon 180mm F2.8 ED and Canon 200mm FD.
Both were good. All need to be stopped down really. Lenses generally are not as well made as scopes. Pentax 67 300mm EDIF is the best.
Also rare and expensive (US$2000).
It depends on the CCD. The larger the CCD the more particular you will have to be.
I am now using Pentax 67 F4, 55mm, 165mm and 300mm.
I used the 55 on the weekend and it was good but some aberrations in the right side with the Proline 16803 (44mm square chip). Stopped down to F8 and binned 2x2 looked pretty good.
I did not use the others yet.
Greg.
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