The Minolta Dynax 404si is a 35mm camera from the 1990s. It belongs to the group of SLR cameras with interchangeable lenses. In the USA, it was offered as the Minolta Maxxum STsi. In the home country, the manufacturer marketed this model as Minolta Alpha Sweet S. In addition, there was a model with the ability to imprint the shooting date in the photos (QD / Quartz Date model). However, this model has a calendar only up to the year 2019.
The lenses of the 35mm camera can be interchanged. It comes with a Minolta A bayonet. You can often find this model with a zoom lens. However, there is a wide range of suitable lenses. The lens is focused by autofocus.
Of course, the camera also has a light meter. Films with DX encoding on the cartridge are automatically detected and the sensitivity is set according to the respective value. Here, films with a sensitivity of ISO 25 to ISO 5000 are possible. If you set the sensitivity manually, you can choose from values from ISO 6 to ISO 6400.
The Minolta Dynax 404si comes with all important exposure modes. There is a manual mode. Here you choose aperture and shutter speed completely freely. In aperture priority or shutter priority, the user selects one value and the camera adjusts the other. In program automatic, the camera adopts both values. In addition, there are modes for portraits, portraits at night, landscape photos, close-ups and sports pictures.
The shutter speed ranges from 1/2000 second to 30 seconds. There is also a Bulb mode for long exposures. Here, the shutter remains open for a variable duration. The possible aperture values depend on the lens, of course. An exposure compensation of plus-minus 3 stops is available in the automatic exposure programs.
Of course, there is also a built-in flash with the camera. The built-in flash has a guide number of 12 at ISO 100, and it takes about three seconds to charge. It can be switched on if desired. The flash comes with a fill mode and a red-eye reduction mode. Additionally, an external Minolta flash can also be used with the SLR. The flash sync speed is 1/90 second.
With a size of 13.5 x 9 x 5.85 cm, the Minolta Dynax 404si weighs 350 grams. This value refers to the pure housing without films and lens. There is a thread for a tripod on the bottom of the camera. For selfies and group pictures, there is a self-timer with a lead time of ten seconds. Modes for multiple exposures and bracketing are also available.
Two CR2 batteries (eBay / Amazon*) are responsible for the power supply. These also power the information display on the top of the Japanese camera. One battery charge is enough for about 400 pictures. The batteries are relatively inexpensive and easy to get online.
Films for the Minolta Dynax 404si
The Minolta Dynax 404si was built for 35mm format. Nice 35mm films for color or black and white pictures with the Japanese SLR are the Kodak Portra 400* and the Kodak T-Max 100*. Both films are well suited for everyday photos and can convince test reports.
The Minolta Dynax 404si exposes an area of 24 mm x 36 mm. So at least 36 exposures fit on a 36 roll of film. The film is automatically transported by the SLR with a motor. On average, the camera can take 1 picture per second. The film is automatically transported back to the cartridge when the end of the roll is reached.
Technical datasheet
| Attribute | Specification |
|---|---|
| Type of Camera | Single lens reflex camera |
| Film format | 35mm |
| Film transport | Automatic |
| Film transport mechanism | Motor |
| Pictures per second | 1 |
| Picture format | 24 mm x 36 mm |
| Lens mount | Minolta A mount |
| Focus | Autofocus |
| Exposure times | 1/2000 second to 30 seconds, Bulb |
| Bulb mode | Yes |
| Light meter | Yes |
| Supported film speeds | ISO 25 to 5000 |
| Auto DX (Film sensitivity) | Yes |
| Exposure modes | Program automatic, Aperture priority, Shutter priority, Manual mode |
| Exposure compensation | ± 3EV (0,5EV to) |
| Date imprinting | Model variant |
| Double and/or multiple exposure function | Yes |
| Flash | Integrated flash |
| Flash modes | Fill-in flash, Red-eye reduction |
| Flash Connection | Connection for Minolta flash units |
| Flash sync speed | 1/90 s |
| Tripod mount | Yes |
| Cable release thread | No |
| Self-timer | Yes, Self-timer function with 10 seconds lead time |
| Power supply | 2x CR2 batteries |
| Size | 13,5 x 9 x 5,85 cm |
| Dimensions in inches | 5.31 x 3.54 x 2.30 inches |
| Weight | 350 Grams |
| Names in other markets | USA: Minolta Maxxum STsi, Japan: Minolta Alpha Sweet S |
| Estimated value / Used price | 49,02 Euro Estimate based on used prices of 98 offers (possibly with different scope of delivery and/or condition). As of June 15, 2026 |
| Average used price in the year 2023 | 47,64 Euro (50.87 US-Dollar) |
| Average used price in the year 2024 | 49,81 Euro (53.04 US-Dollar) |
| Average used price in the year 2025 | 46,90 Euro (49.79 US-Dollar) |
FAQ about the Minolta Dynax 404si
What type of camera is the Minolta Dynax 404si, and what is its film format?
It's a 35mm single-lens reflex (SLR) camera, meaning it uses interchangeable lenses and 35mm film. This allows for a wide range of photographic possibilities.
Does this SLR have automatic exposure modes, and what are its manual control options?
Yes, it offers various automatic modes like aperture-priority, shutter-priority, and program. It also features a full manual mode for complete creative control over aperture and shutter speed.
What is the range of shutter speeds and apertures available on the Minolta Dynax 404si?
Shutter speeds range from 1/2000th of a second to 30 seconds, plus a bulb mode. Aperture settings depend on the lens used, but exposure compensation is available.
How does the camera handle film and what is its built-in flash like?
It automatically advances film and rewinds it at the end of the roll. The built-in flash has a guide number of 12 at ISO 100 and offers fill-flash and red-eye reduction modes.
What are the power requirements for this 90s model and how long does the battery last?
The camera uses two CR2 batteries, which provide power for approximately 400 shots. The batteries are relatively inexpensive and easily replaceable.