On Jul 27, 2005, at 5:46 AM, Frank Wajer wrote:
I've just read the istds manual and don't understand the following:
on page 93 it says that P-TTL is possible with an A lens, however
on page 144 it says it doesn't. I think the same applies to the
istd manual.
Is the manual right?
The manual is incorrect where it says it doesn't. The *ist DS
supports P-TTL flash metering with all A and later series lenses (A,
F, FA, DA, D-FA).
Where the D and DS bodies differ is in their support with M/K-bayonet
lenses. The D will support TTL flash metering with them, the DS goes
to full power flash output only (with the built-in flash) and
provides a Guide Number chart for setting the lens aperture based on
subject distance. The DS supports TTL flash metering with these
lenses only when you use a Pentax-dedicated external flash unit.
Godfrey
