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Posts: 13,856
Registered: ‎12-07-2012

Re: EF 600mm f/4L IS III USM + TC Image Quality

"I just use the 1.8x crop mode on my basically reduces the resolution and file size to 30mb."


I doubt the resolution is reduced or at best very little. You are using the same sensor just less of it. True "crop factor" like a Rebel has is using a totally different sensor. In fact the output might be better since you are in the sweet spot of the sensor electronics lie the AA filter.  There should be less aliasing artifacts plus different output sharpening.

I bet you do see a smaller file but that is because you aren't capturing all the data the sensor can. Not because resolution is less.

EOS 1DX and 1D Mk IV and several lenses!
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