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stacker:docs:tables:macromicrodof [2020/01/07 18:24]
rjlittlefield add formulas for DOF calculations
stacker:docs:tables:macromicrodof [2020/03/29 03:26] (current)
rjlittlefield added more comments about COC
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-**Notes:​** ​ You may be surprised that there'​s nothing in these tables about circle of confusion (COC), like you'd find in most DOF tables. That's because COC is essentially bundled into your choice of aperture. Once you've chosen the aperture setting, then using the numbers in these tables will guarantee that you won't see “focus banding” no matter how good a camera or lens you're using, or how closely you choose to look at the captured images. ​ The math underlying these tables makes assumptions that are reasonable for most lenses, then proceeds using a math formulation that is based on wave optics and guarantees no more than 1/4-lambda wavefront error for green light at the worst focus distances. Roughly speaking, this corresponds to no loss of fine detail and no more than 26% reduction of MTF at any spatial frequency. Send email to [[support@zerenesystems.com]] if you want more information.+**Notes:​** ​ You may be surprised that there'​s nothing in these tables about circle of confusion (COC), like you'd find in most DOF tables. That's because COC is essentially bundled into your choice of aperture. Once you've chosen the aperture setting, then using the numbers in these tables will guarantee that you won't see “focus banding” no matter how good a camera or lens you're using, or how closely you choose to look at the captured images. ​ The math underlying these tables makes assumptions that are reasonable for most lenses, then proceeds using a math formulation that is based on wave optics and guarantees no more than 1/4-lambda wavefront error for green light at the worst focus distances. Roughly speaking, this corresponds to no loss of fine detail and no more than 26% reduction of MTF at any spatial frequency. ​If you need to operate far to the left of the bold section, say to get particularly soft bokeh, then the step sizes listed here will be unnecessarily small because resolution will be limited by the camera sensor and not the optics. ​ In that case a better estimate would be provided by a conventional DOF calculator, using COC set to approximately twice the pixel pitch.  ​Send email to [[support@zerenesystems.com]] if you want more information.
stacker/docs/tables/macromicrodof.txt · Last modified: 2020/03/29 03:26 by rjlittlefield
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