Now we see through a glass, darkly...
- Apr 5, 2016
That it does. But it also magnifies what flaws and resolution limits are in the center of the lens' light circle.Thanks for the feedback! I expected my 80D to equal my 5DIV in resolution and it definitely does not for moon shots, macro, etc. I conclude my expectations are just out of line.
The thing about crop glass working better has me a little mystified; it is my understanding that using FF glass on crop means the sensor uses only the best part of the lens, avoiding the edge issues, especially vignetting.
To display an APS-C image at the same size as a FF image, the enlargement ratio has to be 1.6X more for the APS-C camera. That means to get the same number of lines per millimeter on the finished image, the lens used for the APS-C camera needs to be 1.6X sharper than the lens used on the FF camera. If a lens used on a FF body has a resolving capacity of 850 lpmm (measured on the sensor), one would need a lens with 1,360 lpmm to get the same amount of resolution at the final display size.