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
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|