I don't know how applicable this is but there is a current thread on the
Pentax list that says the factory sets the value for its averaging meters at
14% reflectance (1/3 stop more exposure than 18%). Somebody with access to a
densitometer should take readings of developed shots of a grey card metered
with both averaging and spot metering. A few weeks ago there was also a
thread that said the memorized value of an OM4 exposure on averaging was
different than the indicated initially in the viewfinder before the photo was
taken. I don't recall if the memo function indicated more or less exposure,
but there was a difference.
Warren
> An average
> > measurement including seemingly "darker" zones because of lens-caused
> > fall-off should indicate indeed a less average light-value. But I get
> > instead indications for lower speed, means less light at spot...
>
> This is IMO, not allowable. Which lens you are refering to? Can you
> compare the readings to a good lightmeter and see which one is (more)
> correct?
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