What are the closest and farthest points that will be in acceptably sharp focus?
Sclose = h * So / (h + (So – f)) Sfar = h * So / (h – (So – f)) or, defining hr = h/(So – f) Sclose = So * hr/(hr+1) Sfar = So * hr/(hr-1) Think of hr as the hyperfocal to subject distance ratio. These formulas are also correct when hr is defined as hr = h/So and the N used in computing h is actually Ne. If the denominator is zero or negative, Sfar is infinity.
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- What are the closest and farthest points that will be in acceptably sharp focus?
