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!
> 
> 
> 

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