User ID wrote:
Okaaay. Ive found the discrepency. Its partly me and partly that old devil, Nikon vs Canon.
Firstly, I get 22.7MP, not 27.2MP. The rest of the difference is, as I described earlier, that I am cropping the image myself so starting out with FF I cut it right in half, to 18x24mm. My 45MP body is a Nikon so, even if I were to let the camera engage the APSC format, Id still retain more than 17MP cuz 17 is peculiar to Canons reduced version of the APSC format.
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I had figured from my Nikon cuz my Canon is 50MP and so acoarst my cropping that image myself to 18x24 would leave 25MP. If I were to let that camera internally engage Canons own version of APSC, that would leave 20MP. So, bottom line, I was using Nikon specs.
Okaaay. Ive found the discrepency. Its partly me a... (
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Actually, you were cropping yourself and ignoring the APS-C level of crop which for Nikon is 1.5. Using the Nikon crop factor 45/1.5/1.5=20