Pentax SFX (SF1)

Pentax SFX with SMC Pentax-F (auto-focus) zoom 1:3.5-4.5 35-70mm image by Arty Smokes (Image rights)

The Pentax SFX (SF-1 in US), dating from 1987, was the world's first autofocus 35mm film SLR with built-in TTL auto flash.

Specifications

• Exposure modes: Programmed AE, aperture priority, shutter priority, metered manual. Metering range EV1-EV20 at ISO 100 with 50mm f/1.4 lens. Exposure compensation EV-4 to EV+4 in half steps.
• Shutter speeds: B (up to 7 hours!) to 1/2000s. Flash sync at 1/100s.
• Lens mount: Pentax K-AF. (Can also accept all K-mount manual lenses, and M42 with an adaptor.)
• Lens supplied: SMC Pentax 35-70mm zoom (with macro), max. aperture f/3.5.
• Focusing modes: AF single, AF servo and Manual. Autofocus in approx 0.3s. Minimum distance 0.7m. Spotbeam for low light to 4m.
• Viewfinder: Pentaprism with diopter adjustment. 92% field of view. Features LED for focus, exposure, shutter speed, flash readiness.
• Integral flash: guide number is 14m at ISO 100
• Other features: External LCD with all the info you need, self-timer, auto-wind (1.8 fps) and power rewind of film.
• Power: 1 x 2CR5 6V lithium battery. AA-battery grip is an optional extra.
• Weight: 665g (without battery).

SF1 top view image by Max Morley (Image rights)

Links

• SFX/SF1 on Bojidar Dimitrov's Pentax K-Mount site.
• SFX manual at Mike Butkus Orphan Cameras