Date: Tue, 9 Apr 2002 08:49:17 -0700
From: "Timpe, Jim" <Jim.Timpe@xxxxxxxxx>
Subject: RE: [OM] To infinity.. and beyond?
Allowance for thermal expansion/contraction of the lens/innards etc., I
believe.
- -----Original Message-----
From: Daniel J. Mitchell [mailto:DanielMitchell@xxxxxxxxxxxxx]
Sent: Tuesday, April 09, 2002 8:46 AM
To: 'olympus@xxxxxxxxxxxxxxx'
Subject: [OM] To infinity.. and beyond?
<snip>
Question: it focuses fine all the way up to infinity -- but then it'll
focus a bit further. The focus scale on the lens makes it pretty clear that
this is deliberate -- there's a mark at infinity, and then the scale
continues a bit -- but why? What's the advantage of focussing further away
than infinity?
According to the Olympus sheet that came with my Zuiko 300mm from C.H. Ling,
the focussing beyond infinity is to account for thermal expansion, so
Jim Timpe is corret.
-Stephen Scharf
--
2001 CBR600F4i - Fantastic!
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