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Rent NowThe Tempo 2x Teleconverter for Pentax KR mount is a third-party accessory designed to double the effective focal length of compatible Pentax K-mount lenses, giving photographers extended telephoto reach without purchasing a longer prime or zoom lens. Like other Tempo-branded products, it was marketed as an affordable option in the film SLR era, often manufactured by an outside optical supplier and sold under the Tempo name.
The teleconverter mounts between the camera body and a compatible K-mount lens, optically doubling the focal length of whatever lens is attached, for example turning a 50mm lens into an effective 100mm, or a 135mm lens into an effective 270mm. This makes it a low-cost way to extend telephoto reach for wildlife, sports, or distant subjects using lenses already in a photographer’s kit, rather than investing in additional longer glass.
As with most 2x teleconverters, using this accessory comes with a light loss of two stops, meaning the effective maximum aperture of the attached lens is reduced accordingly, for example an f/2.8 lens becomes effective f/5.6 once the converter is attached. This tradeoff is standard for teleconverters generally and is more pronounced with 2x designs compared to smaller 1.4x converters, since it affects viewfinder brightness, autofocus performance on cameras that support it, and how much light reaches the film or sensor.
Being designed for the Pentax K-mount (KR) automatic diaphragm system, the teleconverter is built to maintain aperture automation with compatible K-mount lenses, allowing the diaphragm to continue functioning automatically as it would without the converter attached, rather than requiring manual stop-down metering.
As with other third-party teleconverters from this era, optical quality and construction can vary depending on the specific manufacturing run, and image quality with any teleconverter is generally most dependent on the quality of the lens it’s paired with. Photographers considering this accessory should keep in mind that teleconverters typically produce the best results with higher-quality lenses and can introduce a noticeable decrease in sharpness and contrast compared to shooting with a longer prime lens directly.
Key Features
– 2x teleconverter for Pentax K-mount (KR) lenses
– Doubles effective focal length of attached lens
– Two-stop light loss (e.g., f/2.8 becomes effective f/5.6)
– Maintains K-mount automatic diaphragm function
– Compatible with Pentax K-mount automatic lenses
– Third-party construction typical of the film SLR era
