Quote:
Originally Posted by JA
I have one of those . Well part of one  - a 10kg or so 275mm diameter planoconvex lens element from the Perkin Elmer 916mm focal length f/4 surveillance camera used in spy/surveillance aircraft and satellites.
Just waiting for an interesting project......
Best
JA |
Those old cameras were designed for film, and would be rather mediocre by today's standards.
BTW, this is the illustration on what I'm talking about. Left is the MTF (10 to 50 line pairs per mm) of
SONY 135mm f/1.8 GM lens that Lens Rentals (Roger Cicala) have found to be the sharpest they have EVER tested. (and they have tested a lot, including many CaNikons
)
To the right are MTF curves, also 10 to 50 lp/mm of a
450mm f/1.8 (yes, that is 250mm
aperture (!)) Strange-Jones astrograph. It has only 4 elements (3 lenses and a mirror), and uses ordinary BK7 glass. It also has zero vignetting, near zero distortion, and it has perfectly flat field.
But it can't do IS, can't be stopped down instantly and can't autofocus.