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16mm/2.8 lens focal length crops (equivalent field of view)

Discussion in 'Sony E-Mount (incl. NEX, A7, A7R, A3000) Forum' started by Dani Solatie, Oct 25, 2010.

  1. Dani Solatie

    Dani Solatie New to SC

    6
    Oct 18, 2010
    Hi everyone,

    Since I only have the 16mm F2.8 lens for my Nex5 and I sometimes miss other focal lengths, I did the maths to find out how many pixels I should crop in Photoshop of the original 14 megapixels image, to get the fields of view of other standard focal lengths.
    I know that this is not the same than shooting with a narrower lens in the first place, but it's better than nothing.

    What I'm trying to do is to compose the pictures' elements trying to forget the 16mm lens' (24mm equivalent in 35) image frame, and try to imagine the frame size I would like for that image while shooting.

    The Nex cameras have a lot of resolution, and I've been testing scaling up the crops with PhotoZoom Pro 3 and then adding some grain with Silver Efex Pro or Lightroom 3 with, at least for me, good results.

    I just wanted to share this in case anyone is interested.
    I tried to upload my Rectangular Marque Tool preset file (for Photoshop) with all these crop options, but the sites uploader wouldn't let me upload that kind of file. Email me if you are interested in the file.

    Anyway, here goes the list:

    28 mm lens equivalent FOV, 3:2 aspect: 4035 x 2690 pixels crop (10.9 mgpx resolution)
    28 mm lens eq. FOV, 5:4 aspect: 3790 x 3032 (11.5 mgpx)

    31.4 mm lens eq. FOV, 1:1 aspect (this is the biggest possible square crop): 3056 x 3056 (9.3 mgpx)

    35 mm lens eq. FOV, 3:2 aspect: 3231 x 2154 (7 mgpx)
    35 mm lens eq. FOV, 5:4 aspect: 3030 x 2424 (7.3 mgpx)
    35 mm lens eq. FOV, 1:1 aspect: 2745 x 2745 (7.5 mgpx)

    40 mm lens eq. FOV, 3:2 aspect: 2826 x 1884 (5.3 mgpx)
    40 mm lens eq. FOV, 5:4 aspect: 2650 x 2120 (5.6 mgpx)
    40 mm lens eq. FOV, 1:1 aspect: 2402 x 2402 (5.8 mgpx)

    50 mm lens eq. FOV, 3:2 aspect: 2262 x 1508 (3.4 mgpx)
    50 mm lens eq. FOV, 5:4 aspect: 2120 x 1696 (3.6 mgpx)
    50 mm lens eq. FOV, 1:1 aspect: 1922 x 1922 (3.7 mgpx)


    I didn't calculate the 4:3 aspect crops because I don't like that aspect ratio.
    But if someone is interested I can calculate them too.

    Cheers,

    Dani
     
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  2. BBW

    BBW Administrator Emeritus

    Jul 7, 2010
    betwixt and between
    BB
    Dani, I bow to you. I couldn't possibly due that math! Please post some of your NEX photos - why not a few examples right here, if you'd like?
     
  3. christilou

    christilou SC Hall of Famer

    Jul 13, 2010
    Sunny Frimley
    This looks like hard work! I think the 50mm might be very useful. I'd better write this down somewhere. Thank you very much :smile:
     
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