jlg1000 wrote:
The reason is because the wave nature of the light:
1) The "F" aperture is the inverse of ratio between the diameter of the hole the light must pass and the focal length.
If we take - for example - a SONY RX100M3, the minimum focal length is 8.8mm and the minimum aperture es F11, so we get a hole diameter of 8.8/11 = 0.8mm
2) If we calculate the Airy disk for that hole and red linght (l=600nm), we get a diffraction resolution of 8 microns.
3) But the pixels pitch of the RX100M3 is 2.41 microns, so the diffraction resolution is THREE pixels, which is very noticeable.
Shouls the manufacturer use even lsmaller apertures, the situation would only worsen.
Bottom line: the minimum aperture is related to physics, not to technology.
The reason is because the wave nature of the light... (
show quote)
YES!!! because of the light factor you have explained, a compact camera with an f stop of f22,on a 5mm lens, this aperture would be about 1/3 of a millimeter,.so what you need to realise is that f22 on a compact is F8,f16 is F5.6,f 4 is F11,f2.8 becomes F8 etc., so at widest aperture all appears sharply in focus.