/////FX vs DX …. battle of the BOKEH
FX vs DX …. battle of the BOKEH2018-02-25T17:37:25+02:00

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FX vs DX …. battle of the BOKEH

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  • CHS
    Participant
    Post count: 62

    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)

    [ATTACH]9610[/ATTACH]

  • Peter Connan
    Participant
    Post count: 818

    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?

  • Leo Theron
    Participant
    Post count: 1582

    @peter Connan 298273 wrote:

    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…

  • CHS
    Participant
    Post count: 62

    Peter

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

  • Peter Connan
    Participant
    Post count: 818

    Thanks Leo and CHS.

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