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Thread: Bought Magic Lantern

  1. #1

    Join Date
    Apr 2008
    Location
    Helsinki
    Posts
    37

    Bought Magic Lantern

    Hi,

    I bought from ebay uk one magic lanter, it came with lens, height 8,5cm, front lens diameter about 4,5cm
    Then there are this condenser lens, which diameter is about 10cm and height 4,8cm
    That would be quite nice in front of Sinar

    My math is not so good that I could calculate aperture of those lenses, so if anyone could provide me some formula for calculation, I would be very pleased.
    Everybody has photograph memory, some just do not have film

  2. #2
    Vitaliy AK
    Join Date
    Oct 2010
    Location
    EU
    Posts
    138

    Re: Bought Magic Lantern

    Quote Originally Posted by Raidahl View Post
    some formula for calculation
    Focal length divided by diameter of front element (glass) will give you approx. F number (eg. FL - 200mm, front element's diameter - 50mm. 200/50=F4).

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