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  1. #1
    kieran2698's Avatar
    kieran2698 is offline Junior Member
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    Default cctv c-mount to 35mm lenses

    I am considering making a telephoto video setup based on a 1/3" ccd cctv camera, a c-mount to 35mm lens adapter, and a telephoto lens.

    The sensor being much smaller than the originally intended 35mm film will result in a magnification of about 5 times. Thus a 500mm lens will give equivalent magnification to a 2500mm lens.

    I understand this has been done many times before, the application being astronomy.

    What I am concerned with, before purchasing anything, is the distance to the sensor with the added adapter.
    I understand that if the distance between the rear lens element and the sensor or film is not correct then the lens will not focus to infinity.

    Has anyone had any experience with this?

  2. #2
    star drop's Avatar
    star drop is offline Guilty as Charged
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    Hi kieran2698,

    Welcome to the forum.
    You will have to wait for others to assist you as I have no astrophotography experience.



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