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How is this different from using a small aperture size? When you reduce aperture size the depth of field increases. So for example when you use f/16 pretty muc
by breadwinner 9mo ago
How is this different from using a small aperture size?
When you reduce aperture size the depth of field increases. So for example when you use f/16 pretty much everything from a few feet to infinity is in focus.
- malfist 9mo agoIs that actually true? I do astrophotography through an f/10 telescope and its focus is very sensitive. I use a focuser that moves the camera 0.04 microns per step. Not doubting you, just asking to understand. Astrophotography doesn't always behave the same as terrestrial photography
- ruined 9mo agoin addition to aperture, percieved depth of field greatly depends on: - focal length (wider is deeper) - crop factor (higher is deeper) - subject distance (farther is deeper) compared to your telescope, any terrestrial photography is likely at the opposite extremes, and at a disadvantage everywhere but subject distance. but, focus is most mechanically sensitive near infinity. adjustment creates an asymptotically larger change in the focal plane as infinity is approached. in a point-and-shoot camera with a wide lens at f16, "infinity" basically means across the street.
- oxw 9mo agoVery small apertures reduce image quality due to diffraction, which this avoids Last page in the paper has a comparison between their approach and f/32 https://imaging.cs.cmu.edu/svaf/static/pdfs/Spatially_Varying_Autofocus.pdf https://imaging.cs.cmu.edu/svaf/static/pdfs/Spatially_Varyin...