The Petri GX-5 is a reflex camera. It was sold by Petri in the 80s. The 35mm camera was built by Cosina and also offered under the name “Cosina CT-9”.
The lenses of the Petri GX-5 can be changed. Lenses with a Pentax K bayonet can be used. It is necessary to focus the lens manually on the desired subject.
The camera has an aperture preselection mode and a built-in exposure meter. This is designed for an ISO range of 25 to 1600. The correct exposure is measured through the lens. The desired aperture and shutter speed can be set by the user. Bulb mode is available for long exposures. An external flash can be used via the hot shoe or PC flash port.
Films for the Petri GX-5
For taking pictures with the Petri GX-5, 35mm films are needed. This type of film is still being produced and can be processed by most photo laboratories without any problems. A 35mm film for color pictures is the Fujifilm Superia 400*. A possible black and white film is the Kodak T-Max 100*
The color film is being developed in the C-41 process. The C-41 films are offered by most photo laboratories.
The Petri GX-5 comes with a self-timer. There is also a connector for a cable release and a thread for a tripod. The dimensions of the Petri GX-5 are 13,6 x 8,5 x 5 cm. It brings 410 g on the scales. The camera needs two LR44 batteries (eBay / Amazon*).
The 35mm camera can today only found in used condition. The condition and functionality of the camera determine the price for a used copy.
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 |
| Tripod mount | Yes |
| Cable release thread | Yes |
| Self-timer | Yes |
| Power supply | 2x LR44 batteries |
| Size | 13,6 x 8,5 x 5 cm |
| Dimensions in inches | 5.35 x 3.35 x 1.97 inches |
| Weight | 410 Grams |
| Manufacturer | Cosina |
| Country of production | Japan |
| Estimated value / Used price | 51,35 Euro 91844842245907156859 Estimate based on used prices of 4 offers (possibly with different scope of delivery and/or condition). As of September 15, 2025 |
| Average used price in the year 2025 | 59,00 Euro (63.86 US-Dollar) |
FAQ about the Petri GX-5
Is the Petri GX-5 a digital or film camera?
The Petri GX-5 is a 35mm film camera. It uses standard 35mm film rolls, which are still readily available and easily developed at most photo labs.
How do I focus the lens on this camera?
The Petri GX-5 has manual focus. You'll need to manually adjust the lens until your subject is sharp. It uses interchangeable lenses with a Pentax K bayonet mount.
What kind of batteries does the camera need?
The Petri GX-5 uses two LR44 batteries. These are readily available and inexpensive to replace, both online and in stores.
Can I use a flash with the photographic device?
Yes, the camera has both a hot shoe and a PC flash connection for external flash units. This allows you to use a variety of flash options to improve your photos.
What's the weight and size of the device?
The Petri GX-5 is relatively compact, measuring 13.6 x 8.5 x 5 cm and weighing 410 grams. It's a manageable size for carrying around.