>>3273071>Diffraction is uniquely determined by the actual f/numberAgain, it’s not. F/number is the ratio. The Hubble is way slower at f/24 and is sharper than anything you’ve ever had. That’s because its focal length is something like 56000mm, so its aperture is quite literally 2 meters. Your nifty fifty at f/8 is only about 6mm.
It’s the literal SIZE of the aperture, not the f/number. Read up on airy disks