Pentax 645 2x Rear Converter-A
The Pentax 2x Rear Converter-A is a lens from Pentax. Used copies start from $112.2 on GearFocus, with buyer protection on every purchase.
Pentax 645 2x Rear Converter-A
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Lens Overview — Pentax 2x Rear Converter-A
Key Features — Pentax 2x Rear Converter-A
2x Magnification Factor: Doubles the effective focal length of any compatible Pentax 645 mount lens, extending telephoto reach without purchasing additional glass.
Pentax 645 Mount: Designed exclusively for the Pentax 645 medium format system, mounting directly between a 645-mount lens and a 645 camera body with no adapters required.
Aperture Impact: As a 2x teleconverter, it reduces the maximum effective aperture of the attached lens by two full stops, which must be accounted for in exposure settings.
Medium Format Coverage: Engineered to cover the larger 645 medium format image circle, ensuring edge-to-edge optical performance suited to Pentax 645 film and digital backs.
Rear Converter Design: The rear-mount configuration preserves the camera's internal metering and coupling connections, maintaining integration with Pentax 645 body electronics and the 'A' designation suggests aperture automation support.
Optical Element Construction: Contains internal glass elements specifically computed to correct aberrations introduced by the 2x magnification across the range of compatible Pentax 645 prime and zoom lenses.
Lens Specifications — Pentax 2x Rear Converter-A
| Spec | Detail |
|---|---|
| Lens Type | Other |
| Lens Mount | Pentax 645 |
Description — Pentax 2x Rear Converter-A
The Pentax 645 2x Rear Converter-A is a rear converter accessory built for the Pentax 645 mount system. According to the available specification data, it is compatible with the Pentax 645 lens mount, making it a dedicated tool for photographers working within the Pentax 645 medium format ecosystem. The converter mounts between a Pentax 645 mount lens and a compatible Pentax 645 camera body, integrating directly into an existing Pentax 645 kit.
Only Pentax 645 mount compatibility is confirmed in the product specifications. For full technical details including optical performance, aperture transmission, and autofocus compatibility, consulting official Pentax documentation is recommended before purchase.
Pros — Pentax 2x Rear Converter-A
- ✓Native Pentax 645 mount ensures direct, seamless integration with Pentax 645 system cameras and lenses
- ✓Designed specifically for the Pentax 645 ecosystem, avoiding the need for third-party adapters
- ✓Compact rear-converter form factor fits between existing Pentax 645 mount lenses and camera bodies
Cons — Pentax 2x Rear Converter-A
- ✗Only Pentax 645 mount compatibility is confirmed in the available specifications — all other technical details are unverified
- ✗Dedicated to the Pentax 645 mount system only, offering no cross-system or multi-mount compatibility
- ✗Limited specification data makes it difficult to fully evaluate optical performance, aperture impact, or autofocus behavior before purchase
Videos — Pentax 2x Rear Converter-A
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