The AE-1 with shutter speed-priority AE and TTL metering became wildly popular in Japan and overseas. However in a few overseas markets, the AE-1 had a high price tag. There were also many users who still preferred manual metering. In response to these people, the AT-1 was developed. It had the same body as the AE-1. It featured match-needle metering and TTL center-weighted averaging metering with CdS photocell. The camera could use the same accessories as the AE-1. Shutter Four-axis, horizontal-travel focal-plane shutter with cloth curtains. X, B, 2, 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000 sec. All speeds controlled electronically. Built-in self-timer (with blinking LED). Flash Sync X-sync automatic-switching sync contacts with German socket and hot shoe. Viewfinder Fixed eye-level pentaprism. 0.82x magnification, 93.5% vertical coverage, 96.3% horizontal coverage. Split-image rangefinder encircled by microprism rangefinder at center of fresnel matte screen. Metering match needle, overexposure warning (also battery check indicator), and underexposure warning provided. Exposure Control CdS cell for TTL full-aperture, match-needle center-weighted averaging metering. Metering range at ISO 100 and f/1.8 lens: EV 3 – 17. Film speed range from ISO 25 to 3200. Power Source One 4G-13 6 V mercury oxide battery or 4LR44 alkaline battery Film Loading & Advance Slotted take-up spool. Advances with camera-top lever's 120 stroke (partial strokes enabled). Ready position at 30. Frame Counter Counts up. Resets automatically when camera back is opened. Film Rewind Camera-top crank