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stacker:docs:tables:landscapes [2021/10/27 00:35] rjlittlefield added formula to reproduce numbers |
stacker:docs:tables:landscapes [2021/10/27 00:47] rjlittlefield |
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| // (Tech note: The math underlying these tables 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 25% reduction of MTF at any spatial frequency. The numbers in the table can be closely reproduced by this formula: // | // (Tech note: The math underlying these tables 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 25% reduction of MTF at any spatial frequency. The numbers in the table can be closely reproduced by this formula: // | ||
| - | * // Focus distance in meters = 1 / (1/FL - 1/(FL+ (FrameNumber-1)*(0.00055*(2*FNumber)^2) ))/1000 // | + | * // Focus distance in meters = 1 / (1/FL - 1/(FL+ (FrameNumber-1)*(0.00055*(2*FNumber)^2) )) / 1000 // |
| // Send email if you want more information.) // | // Send email if you want more information.) // | ||