The Dynax 404si is an entry level autofocus 35mm film SLR camera using the Minolta AF mount, manufactured by Minolta and release in 1999. In the Americas it was known as Maxxum STsi and in Japan it was called α Sweet S (Alpha Sweet S).
The electronic controlled shutter is vertical travelling with speeds from 20s to 1/2000 sec, plus bulb and a flash sync of 1/90 of a sec. The metering is a TTL based system using a 8 segment silicon photo cell. It has a sensitivity of 1 to 20 EV and in spot mode 4 to 20 EV (ISO 100, 50mm f/1,4. Metering is based on using DX encoded film, which can also be manually set from 6 to 6400 ISO in 1/3 inc. The exposure modes include, program, aperture priority, shutter priority, manual exposure along with settings for portrait, landscape, close-up, sport, night. The film transport has a motorized drive with film automatically advancing after exposure. Drive modes includes single frame, continuous for up to 1 fps, self-timer and multiple exposure. The built-in flash has a GN of 12. The camera is powered by two CR2 batteries.