Originally posted by KX-Digital It never did interfere with the spot-metering inside the Olympus OM4/OM4ti, OM2sp and OM3/OM3ti, nor with the one in Ricoh XR-X to mention just a few. Also for the Minolta 9000 which also had spotmetering Minolta offered a screen with a split-image-field.
But regardless of how specific cameras coped with split image and spot metering, current production cameras, which do not have light path separators built into the mirror for metering, but measure light on the focusing screen, including
ALL current pentax cameras, do have this problem
Quote: Camera's where the ligh metering is not taken from the screen are generally not affected by the type of matte-screen installed (From Pentax this includes the LX). They do often need circular polarization-filers instead of regular ones.
note the LX was not a spot meter with perhaps 1% of the image in the metering, but from memory about 5% of the image, this would help.
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Absolutely true
yes regarding darkening, this is why even 20 years ago when I wanted a camera for use primairly with a long tele, I went for a ground glass vfocusing screen, the split image was useless
Quote: This is probably the true reason, but many people still prefer to manually focus, especially Pentax and Nikon users which can still use their MF lenses on their AF and digital camera's.
The point is, other than pentax, no other manufacturer offers full metering capability across all models. the canikon users that can, are purchasing pro level cameras. It is curious they spend all that money oh the hiogh end camera with good AF and put a 30 year old lens on the camera.