The 645Z lenses are comparatively slow-moving considering that they were developed for film cams as well (60mm x 45mm) as well as in my opinion Pentax will certainly generate in the future a tool layout cam with that sensing unit's measurement, so 80 % bigger than the current sensing unit that is 70 % bigger compared to FF. With such a larger sensing unit the plant element would be 0.57 and the Reliable F-ratio (or 35mm comparable F-ratio) would be 1.6, virtually 1.4 which is standard in FF. Here is my homepage; go to website - (...)
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