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Thread: Need some help regarding lenses magnification

  1. #1
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    Default Need some help regarding lenses magnification

    I did a quick lookup regarding lense magnification but couldn't grasp the concept.
    Let's say I have a 24mm lenses that gives a magnification of 0.16x ( Or 1:6.25) have a minimum focusing distance at 0.25m. If I want to find the effective magnification on a 1.6x
    crop factor camera, do I use the effective focal length (38.4mm) in the calculation, as in if
    I'm using a magnification calculator?

  2. #2

    Default Re: Need some help regarding lenses magnification

    The magnification remains the same whether the lens is used on a crop or FF body.

    Magnification = size of image (on sensor/film) / size of actual object

    The image size remains the same for the same lens at the same distance (focusing does affect the image size somewhat for most lenses).
    Last edited by Edwin Francis; 6th July 2010 at 03:13 AM.

  3. #3
    Senior Member engrmariano's Avatar
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    Default Re: Need some help regarding lenses magnification

    if you use your 24mm in FF (24mm X 36mm), you can take a picture of on object the size of 150mm x 225mm.

    if in crop (15mm x 22.5mm), object size is 93.7mm by 140.6mm.

    do the math > 24/150 or 36/225 or 15/93.7 or 22.5/140.6 = 0.16

  4. #4
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    Default Re: Need some help regarding lenses magnification

    Okay thanks guys!

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