"Žvilgsnis" <Zvilgsnis@-trinti-gmail.com> wrote in message news:h1crcv$6bb$1@trimpas.omnitel.net...

>bet ar tai trukdo centriukui - reiktų paieškot info, kaip ten 
> tiksliai yra.

Pleištai kartu su tamsiais objektyvais tikrai gadina gyvenimą už jų esančiam ekspodavikliui.
Gamintojas sako:
Spot Metering Mode: Our testing showed spot metering mode to be within factory tolerance for all AF lenses having a maximum aperture of f2.0 or larger (lower f number). Lenses having a maximum aperture smaller than f2.0 (lager f number) will show a significant shift toward increased exposure, with the shift increasing for lenses with smaller maximum apertures. Spot metering mode is NOT RECOMMENDED when using a split prism focusing screen with lenses slower than f2.0. However, if spot mode must be used, it is strongly advised to first take a test shot, check the histogram, and adjust exposure compensation as required.
http://www.katzeyeoptics.com/item--Pentax-K10D-K20D-Focusing-Screen--prod_K10D.html (skyrelis "papildoma informacija", "product details")

Pratestavus su šviesiu objektyvu prie f/1.4, f/2 ir f/2.8 skirtumų tarp taškinio ir matricinio eksponavimo nesimato beveik jokių
O štai su tamsiu kitiniu prie f/5.6 taškinis akivaizdžiai šviesina