I recently ordered an APO Nikkor 360mm from a camera store, and got it today. Th e invoice says it's listed as a 360mm, but the front of the lens says 305mm. I h eld it up and measured the focal length; the image at infinity comes into focus 14" behind the front plane of the lens (360mm) and 12" behind the rear plane. My question is, do I have a 305mm lens, or a 360mm? Were the graphic arts lenses m easured differently than ones used for LF photography?
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