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  1. #1
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    Default FX vs DX .... battle of the BOKEH

    OK so this is something that I always wanted to try, although I sort of new what the outcome should be. So a while back I took the same shots with my Full Frame D3s and 300m f2.8 as well as with my D7200 ( 1.5 crop DX) and 70-200mm lens.

    So technically the 70-200mm ( at 200mm) on the crop sensor should give me 300mm f2.8, but what would the effect on the bokeh be, compared to the true 300mm on a FX body.

    As you can see there is a noticeable difference in the out-of-focus back ground detail. It is clear the the full frame sensor gives a smoother ( more out of focus effect) than the crop sensor with a 200mm lens.
    The model was about 6m away from me in both shots and the plant about 10m.
    ( Interesting that the 70-200mm has a little bit less "reach" then the 300mm fixed lens)

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  2. #2
    Frequent Member Peter Connan's Avatar
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    Default Re: FX vs DX .... battle of the BOKEH

    That is quite a difference!

    Did you possibly extend the test to see what f-stop you need to close the 300 to to get around the same background detail?

  3. #3
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    Default Re: FX vs DX .... battle of the BOKEH

    Quote Originally Posted by Peter Connan View Post
    That is quite a difference!

    Did you possibly extend the test to see what f-stop you need to close the 300 to to get around the same background detail?
    Note:

    - If the 300 is stopped down to f4, the rendering would be quite close to the 70-200 at 2.8.

    - The Nikon 70-200 is a well known focus breather, so 200 might not be 200 at all - the actual focal length is dependent on the focusing distance.

    HTH...
    Best,

    Leo Theron
    ... see my pictures HERE

  4. #4
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    Default Re: FX vs DX .... battle of the BOKEH

    Peter

    I only shot it at 2.8 because that is usually the f-stop I use on these lenses.

  5. #5
    Frequent Member Peter Connan's Avatar
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    Default Re: FX vs DX .... battle of the BOKEH

    Thanks Leo and CHS.

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