Pentax 645 1.4x Rear Converter-A Teleconverter
The Pentax 1.4x Rear Converter-A is a lens from Pentax. Check GearFocus for current availability, with buyer protection on every purchase.
Pentax 645 1.4x Rear Converter-A Teleconverter
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Lens Overview — Pentax 1.4x Rear Converter-A
Key Features — Pentax 1.4x Rear Converter-A
1.4x Focal Length Extension: Multiplies the focal length of the attached lens by 1.4x, giving medium format shooters additional reach without switching lenses.
Pentax 645 Native Mount: Mounts directly between a Pentax 645 body and compatible 645 lenses, ensuring a secure, native fit with no adapters required.
Medium Format Compatible: Purpose-built for the Pentax 645 medium format system, covering the larger image circle required by 645 format sensors and film.
Rear Converter Design: Attaches at the rear of the primary lens, preserving the lens's autofocus and aperture communication with the camera body where supported.
Approx. 1-Stop Light Loss: As with most 1.4x teleconverters, expect approximately one stop of light reduction when in use, which should be factored into exposure settings.
OEM Pentax Accessory: Manufactured by Pentax specifically for the 645 system, avoiding the optical quality and fit concerns that can come with third-party alternatives.
Lens Specifications — Pentax 1.4x Rear Converter-A
| Spec | Detail |
|---|---|
| Lens Type | Other |
| Lens Mount | Pentax 645 |
Description — Pentax 1.4x Rear Converter-A
The Pentax 645 1.4x Rear Converter-A is a teleconverter accessory built around the Pentax 645 lens mount. It is designed to integrate with the Pentax 645 medium format system, mounting between a compatible Pentax 645 body and lens. The specifications confirm a Pentax 645 mount, placing this firmly within that medium format ecosystem.
For photographers already working within the Pentax 645 system, this converter offers a native-mount solution for extending reach with compatible lenses. No additional optical, mechanical, or electronic specification data is present in the available product data, so prospective buyers should reference official Pentax documentation for details on aperture transmission, optical element configuration, or other technical characteristics before making a purchase decision.
Pros — Pentax 1.4x Rear Converter-A
- ✓Native Pentax 645 mount ensures direct compatibility with the Pentax 645 lens ecosystem
- ✓Designed specifically for the medium format Pentax 645 system, avoiding third-party fit concerns
- ✓Listed under medium format lenses, confirming it is purpose-built for that format class
Cons — Pentax 1.4x Rear Converter-A
- ✗Specifications provided are extremely limited — optical details such as element count, coatings, and aperture reduction are not documented in the available data
- ✗Compatibility is restricted exclusively to the Pentax 645 mount, offering no cross-system flexibility
- ✗No additional mechanical or electronic specification data is available to assess build quality or feature set
Videos — Pentax 1.4x Rear Converter-A
HD Pentax-DA 1.4x Teleconverter Pre-Production Footage — Pentax Forums