Graydon,
I've never seen shake reduction focal length before.
The variation with the DA 35mm macro makes me wonder.
Is it trying to figure actual length of the lens from focal distance used?
Macros can change a lot depending on focal distance.
This would change the actual length of the lens for shake.
Regards,  Bob S.

On Thu, Apr 30, 2009 at 8:03 AM, Graydon <o...@uniserve.com> wrote:
> The DA 35 Ltd, on the other hand, was a surprise:
>
> Lens                                      Focal Length    SR Focal Length
> smc PENTAX-DA 35mm F2.8 Macro Limited        35.0 mm        34 mm
> smc PENTAX-DA 35mm F2.8 Macro Limited        35.0 mm        35 mm
> smc PENTAX-DA 35mm F2.8 Macro Limited        35.0 mm        37 mm
> smc PENTAX-DA 35mm F2.8 Macro Limited        35.0 mm        41 mm
> smc PENTAX-DA 35mm F2.8 Macro Limited        35.0 mm        46 mm
>
> Shake reduction focal length appears to be interactive in some way
> depending on *something*, I'd assume how far the front element has
> moved.  (This lends credence to the view that it's really a small zoom.
> :)

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