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Thread: Bocha formula

  1. #1

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    Bocha formula

    Had a chance to go all " Walker Evans" on my 4 1/2 projection lens. I noticed that the Bocha Swirl ( BS ) had a noticeable useful range. I Used Whatever subject To Film plane ( WTF ) distance as a baseline. When background is less than 2WTF behind subject, all you have is WTF. From 2-5WTF we now have a useful Background to Film plane Distance ratio ( BFD ) Seems a universal that 2-5 WTF's, ends up being a BFD.
    I propose the following formula for those that know what bokah is, but don't know how to get it. Expressed as a ratio between camera, subject, and background.
    WTF / BFD = BS
    Attached Thumbnails Attached Thumbnails BFDa em.jpg  

  2. #2
    Jerevan's Avatar
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    Haha... you are too funny, man! It really is BS! And a BFD, too.
    “Do your work, then step back. The only path to serenity.” - Lao Tzu



 

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