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Did you miss the part where I introduced F-number into discussion instead of the lens size? What do you think will happen to DoF when I take my huge 70-200 and
by rimliu 8y ago
Did you miss the part where I introduced F-number into discussion instead of the lens size?
What do you think will happen to DoF when I take my huge 70-200 and close it down to 22?
- vortico 8y agoIn that case the aperture diameter will decrease. f-number does not directly affect depth of field, except through the aperture diameter.
- rimliu 8y agoF-number describes the aperture diameter, it has no way to affect anything. The same as meters do not affect the distance. However, when you close the aperture on the large lens, the lens still stays large. That was exactly my point: it is about aperture, not the lens size. I get what you say about physically larger lenses having larger apertures in absolute dimensions, not the ratio, however that does not help smartphones, because of the distance of the focal plane and the sensor size. And this where the limiting factor is.
- vortico 8y agoThis discussion is about shallow DoF. You cannot have shallow DoF with a lens with a small aperture diameter. Both the aperture diameter and sensor must be large.