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32MM DIAMETER B&L ACHROMAT WITH CENTER MIRROR
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Item No: L3923
Price: $14.00
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| Very unusual mirror/lens combo. Cemented achromat has a diameter of 32mm with a focal length of 180mm. In the center of the lens is an attached mirror with a diameter of 9mm. When you look through the back of the lens the mirror is spherical with a focal length of about 180mm. The other side is convex. Edge thickness is 8mm, center thickness is 9mm. These appear to be unused but have been in storage for some time so some of the aluminization is starting to come off. They may have been the corrector/secondary for some sort of small cassegrain or catadioptic design. A rare find! |
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