I post too Much on Here!!
- Jan 29, 2011
Please read about equivalence. Diffraction and noise (and aperture) are all related to ultimate subject magnification. With a ff camera you have to enlarge the captured medium more than you do the medium format capture so the impact of noise and diffraction is more from the smaller format.Raising ISO and stopping down the lens beyond f16 introduces noise and possibly the lens will show the effects of diffraction.
On a windy day with moving elements a longer exposure time is no good or if you simply want to freeze even slow moving action.
I have an understanding of equivalence, yet he did precisely that, shot his scene at 32mm f16 on the GFX yet he needed to focus stack as his DOF was too shallow to get the background and foreground in focus in one shot. Watch his video and you can see for yourself.
As I said earlier, if you divide the aperture, focal length and iso by the crop factor, in this case 0.79, you get two images with identical framing, depth of field (and diffraction) and noise if the two sensors were made identically. Well the truth is the larger sensor will always display slightly less noise but that's another rabbit hole for another time.
This link might help but it really pisses off some members because I link to it quite often. http://www.josephjamesphotography.com/equivalence/
The biggest issue that most people run into when they are looking at different sensor outputs is to compare them on a monitor at the same magnification, typically 100%. This is fallacious as you are enlarging the higher mp image more. There is a way to view images with different mp numbers at the same magnification in PS but it can be a bit fiddly and I have never seen a single YouTuber actually do it correctly.