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The topic to inspire your creative juices this month is BOXES Please don't forget to vote on November's LEAVES challenge and please re-vote if you already did but before the recent forum upgrade.

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F1.2 pro glass

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  • #31
    Re: F1.2 pro glass


    I was surprised to read of such a large difference, so I checked with the Cambridge in Colour DoF calculator. Of course, DoF is not a 'hard and fast' calculation and depends a lot on how you define 'sharpness' but, using their rather strict criteria of viewing a 20" print from 25 cm (less than a foot away), the results I got were:


    17mm at f/1.2, subject at 12': DoF= 2.95'

    17mm at f/1.8, subject at 12': DoF= 4.5'



    Significant, yes, but not as 'major' as you suggested. Also, if you were photographing a 'group' of people, might not the greater depth of field be considered more useful?
    Mike
    visit my Natural History Photos website:
    http://www.botanicdesign.co.uk/Natur...story/home.htm

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    • #32
      Re: F1.2 pro glass

      Originally posted by MikeOxon View Post
      I was surprised to read of such a large difference, so I checked with the Cambridge in Colour DoF calculator. Of course, DoF is not a 'hard and fast' calculation and depends a lot on how you define 'sharpness' but, using their rather strict criteria of viewing a 20" print from 25 cm (less than a foot away), the results I got were:


      17mm at f/1.2, subject at 12': DoF= 2.95'

      17mm at f/1.8, subject at 12': DoF= 4.5'



      Significant, yes, but not as 'major' as you suggested. Also, if you were photographing a 'group' of people, might not the greater depth of field be considered more useful?
      Regards,
      Mark

      ------------------------------
      http://www.microcontrast.com
      Too much Oly gear.
      Panasonic GM5, 12-32, 12-35, 15. Laowa 7.5.
      Assorted legacy lenses, plus a Fuji X70 & a Sony A7S.

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      • #33
        Re: F1.2 pro glass

        Since drmarkf mentioned an iOS App, I might also point out that the Focos App, which works far twin-lens iPhones, can produce the effect of a wide-aperture lens automatically.
        Mike
        visit my Natural History Photos website:
        http://www.botanicdesign.co.uk/Natur...story/home.htm

        Comment

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