How are the TTL and non-metered finders different?
Internally, the actual penta-style prism glass is not so different between them—the main thing is that the TTL contains a strip housing LEDs and sensors which enable the metering process. This strip is located at the top of the viewing area and utilizes an amount equal to 7% of available light with which to meter. It follows, then, that the non-metered finder is considered by some to be “brighter” since there is no light lost to the metering process as in the TTL finder. It is doubtful that this small amount is detectable at all. More accurately, those who prefer the non-metered finder do so because of the full 100% viewable area of focusing screen and because it closely replicates the Hassy NC2 in its more compact housing and slimmer design.
