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Thread: Field of view vs focal length

  1. #11
    Alan Klein's Avatar
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    Re: Field of view vs focal length

    Some say the 90mm has less need for a center filter than the 75mm.

  2. #12

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    Re: Field of view vs focal length

    Quote Originally Posted by Alan Klein View Post
    Some say the 90mm has less need for a center filter than the 75mm.
    Nope, it has fall off as well.

  3. #13

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    Re: Field of view vs focal length

    Quote Originally Posted by Alan Klein View Post
    Some say...

    http://www.subclub.org/fujinon/center.htm

  4. #14

    Re: Field of view vs focal length

    Quote Originally Posted by xkaes View Post
    Look at the bottom of this page for an easy, visual explanation.

    Field of view, angle of view, and picture angle are completely different from angle of coverage, image circle, and covering power. These terms can get confusing.

    http://www.subclub.org/fujinon/indexfuji.htm
    A very nice-looking page with well-organized information. Thanks!

  5. #15

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    Re: Field of view vs focal length

    I have a 90mm and a 75mm for my 4x5.
    To my surprise the 90 sees much more use.

    When using small format I’m a big fan of the 21mm, but I have found that when a tripod is involved I like to set up a bit further away from the scene and prefer a 90mm.

    I am one of those who find that a center filter is not critical with a 90mm.

    Click image for larger version. 

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    Grandagon N 4.5/90mm - TXP320
    "I am a reflection photographing other reflections within a reflection. To photograph reality is to photograph nothing." Duane Michals

  6. #16
    Tin Can's Avatar
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    Re: Field of view vs focal length

    However some like falloff

    and very few can find or afford the very rare center filters

    Quote Originally Posted by Bob Salomon View Post
    Nope, it has fall off as well.
    Tin Can

  7. #17
    Alan Klein's Avatar
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    Re: Field of view vs focal length

    I've found that falloff is more noticeable on some shots than others even with the same lens and even with shooting color or BW. I don;t know why that is.

  8. #18

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    Re: Field of view vs focal length

    Quote Originally Posted by Alan Klein View Post
    I've found that falloff is more noticeable on some shots than others even with the same lens and even with shooting color or BW. I don;t know why that is.
    It could be the f-stop you are using on the lens.

    http://www.subclub.org/fujinon/center6.htm

  9. #19

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    Re: Field of view vs focal length

    Quote Originally Posted by xkaes View Post
    It could be the f-stop you are using on the lens.

    http://www.subclub.org/fujinon/center6.htm
    Joe, R'stock and Schneider recommend stopping down at least two stops from wide open when using a CF. This isn't because of mechanical vignetting by a filter in front of the lens as you wrote on your site, it is because of mechanical vignetting by the lens' rear barrel.

  10. #20

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    Re: Field of view vs focal length

    Quote Originally Posted by Dan Fromm View Post
    Joe, R'stock and Schneider recommend stopping down at least two stops from wide open when using a CF. This isn't because of mechanical vignetting by a filter in front of the lens as you wrote on your site, it is because of mechanical vignetting by the lens' rear barrel.
    Exactly my point. If it is used wide open, the CND filter will not give the same results as if stopped down.

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