Why no "off the sensor" metering?

Started Dec 5, 2012 | Discussions thread
steephill Veteran Member • Posts: 9,861
One example from Pentax

Pentax had a similar off-the-film TTL system which also worked for flash just like the Olympus system. They carried this forward on their first DSLRs (*istD) using it for flash metering. This gave them 2 flash control methods - off the sensor and P-TTL, their version of current flash metering techniques which utilise a pre-flash system.

There were two issues with the older system - cost and the reflectivity of the sensor which does not match film. I still use old style TTL flashes with my *istD as it works well with lenses which don't report aperture to the camera body, something the later P-TTL flashes can't do.

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