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Interesting comparison I guess...

Discussion in 'Nikon DX DSLR Forum' started by Donzo98, Jun 28, 2008.

  1. Donzo98

    Donzo98

    Nov 10, 2005
    Merrick, NY
    Same shot...

    D3 and 105 VR, F2.8, ISO 800

    [​IMG]

    D2XS and 18-200mm VR shot at 70mm (equivalent to 105 in FX), ISO 500, F5 (wide open)

    [​IMG]

    Observations...

    105 with the 18-200 is not really 105!!

    105 VR at 2.8 blows away the 18-200 at F5.
     
    Last edited by a moderator: Jun 29, 2008
  2. pforsell

    pforsell

    Jan 15, 2008
    The 18-200 focal length shortens a lot when you focus closer. It is only about 128 mm at 200 mm setting at the minimum focus. This time your camera to subject distance was moderate though. This same focal length shortening applies to the 105/2.8 also. It is 105 mm only at infinity focus.

    The focal length of a lens is always given at infinity focus and it is a conveniently rounded number, your 105 could actually be anything between 103 and 107 mm and the 18-200 might very well be 19-195 mm

    Perhaps a small part of the inconsistency can be attributed to the accuracy of the printed numbers on the barrell and yet a smaller part to the actual crop factor being 1.54 not 1.5 and so on.

    The image quality differences are pretty obvious to the naked eye though.
     
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