Lens
40mm f/1.9.
5 elements in 5 groups.
Single-coated.
Filter Thread
48mm, plastic.
Close Focus
3 feet (0.9m)
Finder
0.5x Albada (silvered single-window).
85% coverage.
Exposure and Metering
Averaging meter. The meter window is below the lens and read through the filter.
Program exposure from EV 4 to EV 17 (f/1.9 at 1/4 to f/18 at 1/400).
ASA range: 25 ~ 400. Later models went from ASA 50 ~ 1,000.
There are only two blades, which serve as both shutter and diaphragm.
Film advances at about 1 frame per second.
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