Best low light FF Canon DSLR

Started 3 months ago | Discussions thread
Dr_Jon Veteran Member • Posts: 6,080
Re: Best low light FF Canon DSLR

J A C S wrote:

steks wrote:

Thanks for all the reactions, to keep things short, is it fair to say that there is difference in low lIght IQ, but it’s wrong te expect a high improvement when using an comparable aperture.

The 6D has a very noticeable improvement over the 5D2 and the 5D in high ISO noise.

Lets compare a 30mm f/1.4 on my 77D cropsenor with a 50mm stopped down to f/2.2 on a 6D (30x1.6=48 and 1.4x1.6=2.2) am I correct when saying, that because of the double in size photosites on the 6D (24,2/20,2x1.6=1.9), you can expect one stop extra sensitivity?

The size of the photosites is a secondary factor. In that case, you get more or less the same noise but a noticeably better resolution (some of it will be lost in the noise).

Furthermore you have the abiltity to use faster primes, lets say a 50mm f/1.4 which also gives you an extra stop?

Actually, this is the factor giving you less noise, at the expense of a shallower DOF.

I said this below, but I'll point it out again in case it's helpful. A f/1.4 lens gives you the same light as a f/2 lens as the camera will just halve the time the shutter is open to give a correct exposure. It only helps if you can reduce the ISO, which changes how much light you collect to give a correct exposure.

So:

Light level Ev 10 (Twilight)

FF, f/2, ISO 200, shutter speed will be 1/500th, light captured will be X
FF, f/1.4, ISO 200, shutter speed will be 1/1000th, light captured will be X
APS, f/1.4, ISO 200, shutter speed will be 1/1000th, light captured will be X/2.56 (-1.36 stops)
FF, f/1.4, ISO 100, shutter speed will be 1/500th, light captured will be 2X

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