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jcolwell wrote:
Reach is based on pixel density, not sensor size. For example, the 5DS and 7DII have the same sensor density, and the same reach. You can crop the FF image to match the APS-C image, or keep it whole; regardless, the reach is the same.
Reach only varies between cameras when they have different sensor densities, with the higher density having the longer 'reach' (i.e. pixels per duck). That being said, not all pixels are created equal, and so if the longer-reach camera has higher noise (for same ISO), then you might not be able to take advantage of the longer reach....Show more →
If the longer reach camera has a bit more noise, you have 3 options to equalize the results: you have to crop out the FF image and resize up, or resize the crop down, or use a 1.4x TC. In any of the 3 cases, whatever noise disadvantages there might be, start to diminish very quickly. So ISO/noise with today's generation of camera just isn't as large an issue as it was before perhaps around 2010 when calling out IQ differences in FF vs APSC.
It has more to do with lens quality and AA filter strengths any more, IMO. Those are the largest contributors to issues I might see personally. I would love to see the 7D3 come out with the new sensor for better DR AND a nullifying AA filter like the 5DSR.
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