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Thread: Using a single lens element

  1. #11
    8x10, 4x5, ..., Tessina
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    Dec 2010
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    Maryland, USA
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    4,222

    Lightbulb Re: Using a single lens element

    Quote Originally Posted by David Aimone View Post
    sounds like a good guestimate.
    It's not a "guestimate". It's the definition of f-stop.

    That's why it's written f/n, like f/2.8 or f/16.

    f is the focal length and n is the numeric aperture.

    - Leigh

  2. #12

    Join Date
    Dec 2009
    Location
    Saratoga Springs, NY, USA
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    601

    Re: Using a single lens element

    I get that, Leigh. I was more questioning my measurements and configuration/setup.

    Thanks for the reminder though of the basics (really). I've taken in a lot over the past 10 months or so (film photography, large format, developing and printing, new and old lenses, alternative processes, etc., etc.) and it's not yet second nature. Ma' brain is full... sometimes I need a refresher!

    Quote Originally Posted by Leigh View Post
    It's not a "guestimate". It's the definition of f-stop.

    That's why it's written f/n, like f/2.8 or f/16.

    f is the focal length and n is the numeric aperture.

    - Leigh
    David Aimone Photography
    Critiques always welcome...

  3. #13

    Join Date
    Dec 2009
    Location
    Saratoga Springs, NY, USA
    Posts
    601

    Re: Using a single lens element

    Here's the result (first test):



    Found an old projector lens with four lens elements. Took the front one out, mounted it on the 4x5 camera (image circle plenty big enough), covered and uncovered it with a cap, and this is what I got! Well, there were a few more steps involved, but basically that was it. Guestimating about 200mm f/4, Efke 25
    David Aimone Photography
    Critiques always welcome...

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