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D800- why bother to crop

ericbowles

Atlanta, US
10631 posts

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"RE: D800- why bother to crop - AF sensor impact"

ericbowles Moderator Awarded for his in-depth knowledge and high level skills in various areas, especially Landscape and Wildlife Photoghraphy Writer Ribbon awarded for for his article contributions to the community Donor Ribbon awarded for his very generous support to the Fundraising Campaign 2015 Nikonian since 25th Nov 2005
Fri 06-Apr-12 11:15 AM

The crop is pretty straight forward, but nobody has mentioned the impact of the number of focus sensors available or the relative size of the AF sensor compared to a DX camera.

The D800 has 51 AF sensors across the full frame - they cover about 70% of the image horizontally. But when you are in DX crop mode, there are 11 AF sensors covering 90% of the frame - placing some sensors outside of the normal composition. The D300s puts 51 focus sensors on a crop frame - 11 sensors horizontally covering the central 75% of the frame.

In relative terms, if you are cropping to DX mode the FX AF sensor is going to be slightly larger covering a less specific area of the image. In other words, the sensor may cover the head of an animal rather than just the eye.

Now I'm not sure whether this is actually the way it works in the camera. My comments are based on illustrations from the respective manuals.


Eric Bowles
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This is a hot, active topic! D800- why bother to crop [View all] , dhmiller Silver Member Donor Ribbon awarded for his support to the Fundraising Campaign 2014 , Wed 28-Mar-12 08:01 PM
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