> It should have the SR focal length set to 420mm; that's the
> only way it knows how angular rotation of the camera affects
> the position of the image on the sensor.

Yes, absolutely.

> Unfortunately that's not possible with an AF lens mounted on
> a TC (such as the Sigma APO TCs) which passes the FA signals.

Yes, unfortunately.

> This means I can't use SR if I'm using my my AF TCs :-(
> Pentax really need to come up with a way for the user to
> indicate that a TC is in use.

Yes, agreed.

> It wouldn't be bad if they
> also eventually release an AF TC of their own (hopefully
> one that works with the new DA* lenses, while I'm dreaming ...)

Long overdue, one of the reasons I bought the Sigma 70-200 & 300 APO's

Maybe I should contact Pentax and ask for a firware revision 8)

John



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