The Carena CX-300 is a classic 35mm camera, the Carena CX-300. It was offered by the German company Photo Porst. The model in this article was produced by Cosina. The Japanese company offered a functionally identical model, the Cosina CT-1 EX.
Another version was offered under the same name. It is based on the Cosina CT-1 G. It can be identified by its maximum exposure time of 1/1000 second.
Lens
The K-mount provides access to a wide range of lenses. Focus is adjusted manually on the lens, while the viewfinder, with its clear split-image and microprism focusing aids, facilitates precise adjustment.
Exposure Settings
The camera features a center-weighted TTL exposure metering system. Once activated, three simple LEDs in the viewfinder guide the photographer to the correct exposure, which is achieved by adjusting the shutter speed (1/2000s to 1s plus bulb) and the aperture. The film speed, from ISO 25 to 1600, is preselected on the body.
Flash System
A universal hot shoe is available for shooting in low light. This works with external flash units with a maximum sync speed of 1/125th of a second.
Additional Features
Other practical details include a tripod mount on the bottom, a frame counter that automatically resets when changing film, and a transport lever that also serves as a shutter release lock.
Dimensions and Weight
Weighing 410 grams and measuring 133 x 85 x 50 mm, the body presents itself as a handy and robust unit.
Power Supply
While the light meter relies on two small LR44 batteries (eBay / Amazon*), the rest of the camera operates purely mechanically. This ensures high reliability, even when the batteries are empty.
Film Recommendations
The camera uses any commercially available 35mm film (eBay / Amazon*). Since it does not have automatic DX detection, its ISO sensitivity must always be adjusted manually using the command dial.
Technical datasheet
| Attribute | Specification |
|---|---|
| Type of Camera | Single lens reflex camera |
| Film format | 35mm |
| Film transport | Manual |
| Film transport mechanism | Quick release lever |
| Picture format | 24 mm x 36 mm |
| Lens mount | Pentax K lens mount |
| Focus | Manual |
| Viewfinder | Pentaprism finder |
| Exposure times | 1/2000 second to 1 second, Bulb |
| Bulb mode | Yes |
| Light meter | Yes |
| Supported film speeds | ISO 25 to 1600 |
| Exposure modes | Manual mode |
| Auto DX (Film sensitivity) | No |
| Date imprinting | No |
| Double and/or multiple exposure function | No |
| Built-in flash | No |
| Flash Connection | Hot Shoe |
| Flash sync speed | 1/125 s |
| Tripod mount | Yes |
| Cable release thread | No |
| Self-timer | No |
| Connection for camera strap | Yes |
| Power supply | 2x LR44 batteries |
| Size | 13,3 x 8,5 x 5 cm |
| Dimensions in inches | 5.24 x 3.35 x 1.97 inches |
| Weight | 410 Grams |
| Company name of the brand | Photo Porst |
| Manufacturer | Cosina |
| Estimated value / Used price | 68,76 Euro Estimate based on used prices of 24 offers (possibly with different scope of delivery and/or condition). As of June 15, 2026 |
| Average used price in the year 2025 | 67,41 Euro (72.52 US-Dollar) |