Rangefinder:
Base Length - 69.25mm
Effective base length - 63mm. (69.25mm x 0.91 finder magnification).
Focus Measurement Range - Rated 1 meter to infinity. Works to somewhat closer distances in practice. Couples as close as 478 millimeters with the 50mm SUMMICRON in its close-focus range.
Film Loading, Advance and Rewind:
Loading - Hinged back and removable, dedicated take-up spool.
Film-type reminder - On back of camera.
Advance - Double-stroke or single-stroke thumb lever. Finely ratcheted so it can be advanced in many smaller strokes.
Advance Confirmation - Revolving line, dot or dots inside rewind knob.
Frame Counter - Automatic reset as take-up spool is removed. Stops at 40 exposures, but hash marks go to frame 44.
Rewind - Move lever to "R," lift knob, and twist. Rewind knob does not rotate as film advances; only the center does to confirm advance.
Shutter top: Horizontal cloth focal-plane. 1-1/1,000 and Bulb. Infinitely variable shutter speeds, see Usage for details.
Flash Sync: Gold internal sync contacts. Unique rear sync terminals, need adapters to use with common PC cords.
Flashbulbs: Fully automatic synchronization to 1/1,000.
Electronic flash: Only to 1/50.
Self Timer: Yes, settable anywhere from 5 to 10 seconds.