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upandaway

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"RE: DX mode file size"

upandaway Registered since 16th Dec 2012
Sun 17-Mar-13 06:46 PM

I can't tell you that your logic differs from reality. I can tell you that my logic has been
called into question before.

Crops changing dynamic range doesn't seem logical to me either. Maybe it depends
on what you do with the crop. If I crop in post and view or print the file at the same
magnification as before the crop (rather than enlarging it to make up for the reduced
size) then I see no difference.

If I shoot the same shot in DX mode (same exposure, distance, setting and light)
then I do see a slight difference. Maybe this is because the DX mode is by default
enlarged in post software to match the FX size.

And that may be what David is describing. In practical use though, my crops still
need to fit the same area on a collateral piece or site that an uncropped photo
would, so I'm enlarging the crop to fit the hole. I do see that enlarging my photos
degrades them.

Reduced dynamic range using DX mode could also be, as you grant, something
involving circuitry or software. I'm hoping someone has a definitive answer on this.

Meanwhile I'll just keep shooting FX. When I think a DX crop may be beneficial, I'll
try to reduce my ISO by 2/3 of a stop at the expense of a longer exposure to make
up for any reduced dynamic range, unless I'm already shooting at ISO 100. Because
I haven't learned to trust the 'Lo' settings. Nikon must not trust them either or they
would have just called it ISO 50 instead of Lo 1.

A general, generic topic DX mode file size [View all] , swannking , Wed 27-Feb-13 01:13 PM
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