Probably a little slack built into the lens to accommodate thermal expansion.
t On 10/28/04 10:41, Anders Hultman wrote: > On Thu, 28 Oct 2004, Graywolf wrote: > >> Surely the moon is at infinity. I can not even begin to see how you >> could have a focus problem. Autofocus problem yes, focus no. > > Long lenses don't always are set to infinity at the end of the scale. If > getting the moon in focus only had required to turn the focusing ring > until it hits the end, it would be easy. But often infinity is a little, > little bit before the end. I once read why that is so, on this list, but > have forgotten the details. Something to do with temperature. > > anders > ------------------------- > http://anders.hultman.nu/ > med dagens bild och allt! > > >
