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Question about m43 crop factor.

Discussion in 'Open Discussion' started by gummyrabbit, Jun 14, 2012.

  1. gummyrabbit

    gummyrabbit Mu-43 Regular

    29
    Sep 15, 2010
    A 45mm Oly lens on my GF1 gives me a FoV of a 90mm lens on a full frame camera.

    Now let's say I put a 90mm lens on a D700. I have the 45mm on the GF1. If I stand exactly 6 feet away from my subject and take a shot with both cameras. Will the subject appear closer in the D700 shot? I guess I'm asking is that do I need to put a 90mm on the GF1 to get the same magnification as the 90mm on the D700?
     
  2. zpierce

    zpierce Super Moderator

    661
    Sep 26, 2010
    Minneapolis, MN
    Zach
    No, they should appear the same. That's the point of equivalent fov :)
     
  3. Lawrence A.

    Lawrence A. Mu-43 All-Pro

    Mar 14, 2012
    New Mexico
    Larry
    IF you put a 90 on the m4/3 camera you will get half the scene cropped out, but that has more to do with the relationship of sensor size to focal length than, strictly speaking, the "magnification" of the lens. The same 90 mm lens on a 6x6cm camera will give you a more or less "normal" field of view instead of the telephoto on the D700. The 45mm on the same 6x6 would be a wide angle, again because of the angle of view in relation to the size of the medium.
     
  4. gummyrabbit

    gummyrabbit Mu-43 Regular

    29
    Sep 15, 2010
    I know the FoV will be the same. But my question was that do I need to move in closer. For example. I'm at a zoo and there's a tiger 25 feet away behind a fence. I have a D700 with a 90mm lens on it and a GF1 with a 45mm lens on it. I take a photo of the tiger with both cameras. Will the GF1 show a smaller image of the tiger?
     
  5. Tincam

    Tincam Mu-43 Regular

    65
    Apr 25, 2012
    Iowa
    Matt
    The tiger will be the same size, more or less.
     
  6. nickthetasmaniac

    nickthetasmaniac Mu-43 All-Pro

    Jan 11, 2011
    No, they will be the same (for all intents and purposes) because the field of view will be the same.
     
    • Like Like x 1
  7. Hikari

    Hikari Mu-43 All-Pro

    Nov 26, 2010
    Yes. But you don't want the same magnification, but the same field of view. In that case, the 45mm is about the same as the 90mm.
     
  8. KVG

    KVG Banned User

    May 10, 2011
    yyc(Calgary, AB)
    Kelly Gibbons
    Same FOV, but 1/2 the DOF.
     
  9. goldenlight

    goldenlight Mu-43 All-Pro

    Jan 30, 2010
    Essex
    John
    Which can be an advantage or disadvantage, depending on how you look at it. :smile:
     
  10. ean10775

    ean10775 Mu-43 All-Pro

    Jan 31, 2011
    Cleveland, Ohio
    Eric
    Just to clarify - the same FOV, but the D700 with the 90mm will give you half the DOF of the m43 camera with the 45mm (assuming the same aperture)