Sometimes it's dead on, sometimes it's way off. I suspect it has
something to do with meter sensitivity. Camera manufacturers used to
publish EV sensitivity charts, too bad they don't do that anymore. The
stopped down metering, (Green Button), works best in bright light if
you're not stopped down too much. Even in bright sunlight stopping down
to f16 or so will usually give inconsistent results. The meter works
much better working continuously with a wide open lens.
The other method, (which since I don't have a K-7, I'm not sure is
available to you), is to hold in the DOF lever, which stops down the
lens and turns /off/ the meter for a lens in A mode, but turns *on* the
meter if the aperture ring is being used. That gives a bit more
consistent results, and it's easier to see when the meter is out of
range before shooting. There is no out of range indicator of course but
if the shutter speed indicator doesn't change as the lens aperture
changes, the meter is out of range.
On 9/13/2010 1:02 PM, Steven Desjardins wrote:
I've never really used an M lens on a Pentax digital, but I'm thinking
about buying one. I know the green button trick, but how well does it
actually work? Metering OK and all that?
--
"His lack of education is more than compensated for by his keenly developed moral
bankruptcy."
-Woody Allen
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