Older crop SLR you had to do a lot of focus recompose so AF is not pixel perfect. Older sensors got noisy at ISO 800 and had strong AA filters. But I would chalk most of that up to it just being a 10 year newer sensor and the RP having outstanding AF. Rp in crop mode seems better than shots I have from my old 10MP APS-C cameras. To me, this means the RP in crop mode is the equivalent of at least a 16mp APS-C. But, the size of the megapixels occupying that space are still full frame sized. So if only 10 are visible through the crop sensor lens, the size and shape of the visible space is equal to that of an APS-C sensor. The results will be the same.ΔΆ6mp on a crop sensor is the same number of megapixels as 26mm on a FF. If you have a FF lens, you can compare crop mode to just taking a regular shot and cropping it yourself. They are the same size in either mode, you are just getting 60% fewer when you crop to 1.6x size. The pixels are hardware on the sensor and don't change sizes. I don't know what you mean by FF or APS-C pixels. So, again, It's a FF shot that has been cropped down to APS-C sized. Canon forces crop mode for EFS unfortunately. So you can get a bigger than APS-C image and resolution by cropping yourself in post. Some crop lenses will give FF coverage at certain focal lengths, or may cover a 1.2x or 1.3x crop. It would be nice if Canon gave us more control like Sony does. As you can see from that article, with third party lenses, the body doesn't always know it is a crop lens and you may have to turn it on manually or crop in post. So Canon applies a 1.6x crop when using Canon EF-S lenses and just leaves you with the middle 10MP out of the 26MP to make sure you end up with a normal image. This article has some examples of what it looks like without the crop mode applied: But since a crop lens won't cover the sensor all the way, that shot would look like a circle with black frame around. The camera just takes a regular 26MP shot.
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