A lens capable of focussing on infinity can achieve infinity focus. Sometimes lenses cant do this. For example, a lens mounted with an extension tube or some other close-focussing adapter may no longer be able to attain infinity focus. A lens with a lens register very different from the camera to which it is attached may also be unable to achieve infinity focus.
cf. adapter, extension tube, infinity, register distance.
Entry last updated 2002-04-03. Term 642 of 1487.
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