Ralf R. Radermacher wrote:
Does anyone know what wavelength corresponds to the IR focus marks on Pentax M lenses?Ralf
Can't see any mention of the IR mark in the SMC lens manual. The FA lens manuals say:
"When taking infrared pictures with infrared film and either a "R2" or "O2" filter, it is necessary to adjust the focus because the point of focus is not the same with infrared light as it is with visible light."
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