Fair enough, I cant say one way or the other knowledgably. However, you talk about Dof being ample enough in WA lenses to cover the innacurracy, so there must be some, and critical focusssing using the scales has to be a gamble, even if only to a small degree.
> -----Original Message----- > From: Fred [mailto:[EMAIL PROTECTED]] > Sent: 19 November 2002 17:54 > To: [EMAIL PROTECTED] > Subject: Re: Once more into the 24 > > > > I have read many times that the point of ininity changes with > > temperature (and possibly other) variations, so all lenses > focus past > > infinity to allow for some movement in this point. > > I'm not so sure about that. From my experience, generally > only the longer telephotos (300mm and longer, usually) focus > past infinity to allow for thermal changes. I believe that, > for shorter lenses, the effects of heating and cooling are so > small, and the DOF ample enough, that there is no need for > focusing past infinity (and such a provision seems to be > lacking in such lenses). > > Fred > > >
