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FX and crop V's DX mode


5 years 6 months ago #609933 by tgkelly
I will be going on a trip next year and going over the gear i need. I have the Nikon 70-200 F4 I was planning to take. Problem is for one
particular shoot it that will be in low light it might be a little short
on focal length. My thought was to use the DX mode but unsure the
effects to noise it would have. I shoot with a D750 which normally
handles noise pretty well just looking to see if anyone has any
experience shooting in low light in crop mode.
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5 years 6 months ago #609946 by Nikon Shooter

tgkelly wrote: Ijust looking to see if anyone has any experience shooting in low light in crop mode.


Some students use DX cameras (that solves in no way focal length
limitations, btw!) in low light situations with good results if we are
talking a bout recent models but a FX will always do better for the
same pixel count in both formats — because the pixels are larger.
Light is free… capturing it is not!
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5 years 6 months ago #609973 by Shadowfixer1
It doesn't matter about the crop mode. It's the same sensor with the same signal to noise ratio. DX mode is no different than cropping to the same size in post. It has no effect on the noise in the image. The noise for that camera will be the same whether shot in FX or DX. You will make the noise that's there more visible because you will increase the image size to normal but that is the same as if you crop it in post. No difference. 
www.betterphoto.com/?ramshots
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5 years 6 months ago #609975 by effron

Shadowfixer1 wrote: It doesn't matter about the crop mode. It's the same sensor with the same signal to noise ratio. DX mode is no different than cropping to the same size in post. It has no effect on the noise in the image. The noise for that camera will be the same whether shot in FX or DX. You will make the noise that's there more visible because you will increase the image size to normal but that is the same as if you crop it in post. No difference. 


This
Why so serious?
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5 years 6 months ago #610056 by garyrhook
+1 on the above. There is never any reason to use DX mode. Just shoot FX, even with DX lenses, and crop in post. You might get some part of the image that will be of value with a non-typical crop.

If you need more reach rent a 70-300 lens. They're quite nice, although variable aperture. For low-light, you're pretty much at the limit of what a reasonable lens can provide. They make an f/2.8 300 and 400, if you want to rent one of those.

The D750 handles noise up to 12,800 just fine. Worst case, B&W conversions and add grain. That's what I do, and I've gotten usable images at ISO 25K.
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5 years 6 months ago #610142 by tgkelly
Thanks everyone, I don't want to buy another lens I do have the 28-300 but isn't very good in lower light. I think I will get better results with the 70-200F4 and crop as needed.
Thanks again
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