Yashica Electro 35 GSN

Lens: 45mm f/1.7.

Optics: 6 elements in 4 groups, just like almost every SLR lens. Single-coated in amber.

Diaphragm: 5 blades stopping down to f/16.

Filter Thread: 55mm. (Optional 57mm slip-on hood.)

Close Focus: 2.6 feet (0.8m)

Finder: Always-bright framelines lit through a separate window. Auto corrects for parallax.

Meter: CdS cell above lens, not TTL. You must compensate filters by setting the ASA dial accordingly. Red OVER light means you're at 1/500 second or more. Yellow SLOW light means you're at 1/30 or slower;

ASA Range (ISO): 1966-1973: 12~500. 1973-1977: 25~1,000.

Shutter: 1/500 - about 30 seconds. Stepless electronic leaf shutter. The slowest speed will vary with aperture: it can go longer than a minute at smaller apertures but only 3 seconds at f/1.7.

Maximum Speed with Flash (sync): 1/500. X-sync at all speeds, better than SLRs.

Power: One px32

The specifications for today's alkaline battery are 335 mAH, 25.5g, 17.1mm diameter, 44.9mm height.

You can use a more common, smaller (170 mAH lithium, 150 mAh alkaline) px28 if you jam in an extra spring and wrap the smaller battery in something to keep it centered in the Electro 35's larger battery hole.

Battery Check Light: Yes, also illuminates frame counter and can work as a small flashlight!