The Petri GX-4 is a reflex camera. The SLR camera was sold by Petri. It was built by Cosina and also offered by the Japanese company under the name “Cosina CT-7”.
The Petri GX-4 offers the possibility of interchangeable lenses. Lenses with a Pentax K bayonet can be used with the camera. The 35 mm camera does not have an autofocus function.
The Petri GX-4 has a built-in light meter. The exposure meter is designed for films with a speed of ISO 25 to ISO 1600. The exposure is measured by the lens.
The camera supports exposure times up to 1/1000 second. In Aperture preselect mode, the aperture can be selected by the photographer and the camera selects the appropriate shutter speed. The desired shutter speed can also be determined manually. The 35 mm camera comes with a Bulb setting option. In addition to a PC flash connection, the Petri GX-4 can be used with hot shoe flashes.
Films for the Petri GX-4
What films do you need for the Petri GX-4? It need 35mm film. Films of this format are still easy to get today and are still being developed. One option for b/w images is the Ilford Delta 400*. A possible film for color pictures is the Kodak Portra 400*.
The color film is being developed in the C-41 process. This development process is available at almost every photo lab.
The 35mm camera has a thread for a tripod. In addition, there is a connector for a cable release and a self-timer. The power supply comes from two LR44 batteries (eBay / Amazon*).
The 35mm camera can nowadays only be bought in used condition. The prices for the camera vary depending on the condition.
Technical datasheet
| Attribute | Specification |
|---|---|
| Type of Camera | Single lens reflex camera |
| Film format | 35mm |
| Picture format | 24 mm x 36 mm |
| Lens mount | Pentax K lens mount |
| Focus | Manual |
| Exposure times | 1/1000 second to 8 seconds, Bulb |
| Bulb mode | Yes |
| Light meter | Yes |
| Built-in flash | No |
| Flash Connection | Hot Shoe, PC-Flash |
| Flash sync speed | 1/100 s |
| Tripod mount | Yes |
| Cable release thread | Yes |
| Self-timer | Yes |
| Power supply | 2x LR44 batteries |
| Manufacturer | Cosina |
FAQ about the Petri GX-4
Is the Petri GX-4 an automatic camera?
No, the Petri GX-4 is a manual focus camera. It doesn't have autofocus. You'll need to manually adjust the focus and exposure settings.
What kind of lenses can I use with this camera?
The Petri GX-4 uses Pentax K-mount lenses. This means you can use a wide variety of lenses, giving you creative control over your images.
How do I set the exposure on the Petri GX-4?
The camera has an aperture priority mode where you choose the aperture, and the camera selects the shutter speed. You can also manually set both aperture and shutter speed, including a bulb setting for long exposures.
What type of film does the Petri GX-4 use?
It uses standard 35mm film. Both color and black and white films are compatible. The film needs to be advanced manually after each shot.
Where can I buy this camera?
Since it's an older model, you'll likely find the Petri GX-4 only on the used market, such as online auction sites or camera specialty stores. Prices vary depending on the condition.