Teleconverter Ricoh GT-2 2x magnification, model 37827, for compatible Ricoh/Pentax screw-mount lenses

The Ricoh GT-2 teleconverter (model 37827) is an optical accessory that doubles the focal length of compatible Ricoh/Pentax screw-mount lenses, effectively converting a lens to 2× magnification. When attached between the camera and the lens—designed for use with a compatible screw-mount setup and often paired with the GA-2 Lens Adapter (sold separately)—it extends the effective focal length (for example, making a 37.5 mm equivalent into approximately 75 mm in 35 mm format) to help capture distant subjects.

Advantages

The GT-2 provides a simple mechanical way to increase reach without changing to a longer lens, doubling focal length while remaining compact and lightweight. It is compatible with many Ricoh/Pentax screw-mount lenses and can be used with the camera’s auto detection and crop functions when supported. The unit is an economical option for photographers who need additional telephoto reach without investing in new lenses.

Suitable for

• Wildlife photography of distant subjects
• Sports and outdoor action where extra reach is needed
• Travel photography when packing space is limited
• Portraits requiring a tighter framing from a distance

Key specifications

• Model: Ricoh GT-2 (37827)
• Magnification: 2× teleconverter
• Compatible mount: Ricoh/Pentax screw-mount lenses
• Effective focal length example: extends to approx. 75 mm in 35 mm format when used with appropriate lens
• Effect on aperture: reduces effective maximum aperture by 2 stops
• EAN: 027075303966

How to use

Mount the GT-2 between the camera body and a compatible Ricoh/Pentax screw-mount lens, or use the GA-2 Lens Adapter if required by your camera model (GA-2 sold separately). Ensure correct alignment of mount threads and secure both lens and teleconverter to the camera. After attachment, verify camera detection and, if available, enable crop or auto-detection features to account for the changed focal length. Because the converter reduces the effective aperture by two stops, check exposure and autofocus performance before critical shooting.

Usage recommendations

Use the GT-2 with fast, high-quality prime or zoom lenses when possible to minimize image degradation. Increase shutter speed or ISO to compensate for the two-stop light loss, and confirm autofocus performance on your specific lens and camera combination before important shoots. Store the teleconverter in a protective case when not in use.