K10 matrix exposure with old A lenses (not digital lenses)

XavierP56

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Hi all,

I'm using old A lenses, like the sigma 75-300 DL or old 28-80 Pentax.

It seems that despite being in matrix exposure, that I have a slight over-exposure.
-1/3 exposure compensation gives way better result with these lens.

I have not issue with the kit lenses.

Not a big issue at all, but WHY ?

Thanks !
 

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