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[OM] Re: [[ Am I going to regret my choice?

Subject: [OM] Re: [[ Am I going to regret my choice?
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Sun, 02 Oct 2005 09:53:19 -0400
C.H.Ling wrote:

> Some interesting figures just measured with my 24/2, 50/1.4 and 85/2:
> 
> 24/2, from infinity to F4 (DOF scale), the lens extended 0.14mm at F8 the 
> lens extended 0.29mm.
> 
> 50/1.4 from infinity to F4 (DOF scale), the lens extended 0.12mm at F8 the 
> lens extended 0.25mm.
> 
> 85/2 from infinity to F4 (DOF scale), the lens extened 0.14mm at F8 the lens 
> extended 0.27mm.
> 
> Allowing for some errors in reading the tiny DOF scale, the movement is
> roughtly double from F4 to F8, 24/2 and 85/2 almost have the same extension
> within the same DOF coverage.
---------------------------------------

That's interesting.  How come?

Chuck Norcutt


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