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Re: [OM] shift lenses; plastic lenses; bellows factor

Subject: Re: [OM] shift lenses; plastic lenses; bellows factor
From: "Julian Davies" <julian_davies@xxxxxxxxxxxxxx>
Date: Mon, 30 Sep 2002 00:07:26 +0100
>> By definition, a lens's focal length is the distance from the lens's
optical center to the film plane.

At infinity focus

>>As you focus closer, the lens's focal
length increases.

NOPE only "internal focusing" lenses change focal length with focus action.
They get shorter as you focus closer. External focus lenses (all Zuikos
except the white ones , the 18 and 24 shift) do not change their focal
length.

Julian



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