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> Calculating the Hyperfocal Distance |
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Calculating the Hyperfocal Distance
I need to calculate the Hyperfocal distance of a large format lens at a particular aperture. Unfortunately my knowledge of optics leaves a lot to be desired.
I will be using the following formulae: - H= F^2/fc Where H is the Hyperfocal Distance F is the Lens Focal Length f is the Lens Aperture Stop c is the Circle of Confusion The Circle of Confusion appears to be very subjective and is also dependant on the film format. I shall use 0.013" as my starting point for 8x10" film. My problem is that the lens in question has a Focal Length of 120mm, but has a Flange Focal Distance of 130.7mm. What value do I use for 'F', 120mm or 130.7mm. Can anyone advise
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Cheers, Barry |
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Thanks Steve, useful link. It compares favourably with my own calculations, which gives me some confidence.
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Cheers, Barry |
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