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Pentax 67 Helicoid Extension Tube | | Latest Review Posted | PENTAX 6x7 TTL Pentaprism Finder
The Asahi TTL is basically the same as the later "Pentax" designated TTL for the P67. The Asahi TTL was used on both the non MLU, non U.S. version camera and the MLU U.S. version 6x7. However the non MLU U.S. Honeywell finder was probably identical in function to the Asahi finder.
The Asahi TTL is a very tough finder. I have dropped mine while on the camera and tripod and dinged it without any change in function. The prism itself is a roof pentaprism and is probably made of high index glass. This type of glass is very dense and therefore making this finder heavy. This TTL in combination with the reflex mirror, corrects the upsidedown and backwads image coming from the lens, so that the shooter is not burdoned with situations like a view camera produces on the ground glass.
The meter in this finder is somewhat accurate, however a gray card is recommended. This metered prism can be faked out by bright or dark areas in the frame and give wrong readings. Over time, the meters can and do drift and need to be recalibrated to bring them back to accuracy. I don't recommend buying one of these TTLs used, unless in mint shape. Better to get the newer Pentax designated one in mint shape if possible. Be aware that outer bay lenses will not always activate the TTL meter. It is a design flaw.
Overall, the Asahi TTL prism is a pretty handy device but takes some getting used to because the viewing area is not 100% and it adds weight to the system. | |
