HD Pentax-DA AF REAR CONVERTER 1,4AW

Features

Exceptional optical performance
Thanks to its state-of-the-art optical design, this rear converter assures the exceptional optical performance that optimizes the potential of the main lens.

With the application of PENTAX-developed HD coating (a high-grade, multi-layer coating designed to minimize reflectance inside the lens while optimizing light transmittance) it lets the user capture crisp, high-contrast images free of flare and ghost images, even under such adverse lighting conditions as backlight.
*When this converter is mounted between a 35mm full-frame SLR camera body and a DFA-series lens, the image size is automatically cropped to the APS-C format. 

HD Coating to enhance imaging performance

The lens incorporates the PENTAX-developed, multi-layer HD (High Definition) Coating. Compared with conventional multi-layer coatings, it improves light transmittance while reducing average reflectance in the visible ray spectrum. This means that it can deliver clear, well-defined images with minimal flare and ghost images, even under demanding lighting conditions such as backlighting.

1.4-times focal length extension for telephoto effect

By mounting this converter between the camera body and the main lens, the user can extend the focal length by 1.4 times. With the HD PENTAX-DA 55-300mmF4.5-6.3ED PLM WR RE zoom lens, the focal length is extended to 77-420mm. At just 20 millimetres long, it is compact and lightweight, allowing the user to reach more distant subjects more easily.
*When this rear converter is mounted, the lens maximum aperture will be smaller (darker) by 1 step.

Unmounted	Mounted

The first PENTAX rear converter to provide AF compatibility
When coupled with an AF lens, the autofocus operation can be performed by the main lens. This rear converter works perfectly with both the camera-driven AF system and the lens-driven AF system (such as the SDM- and DC- series lenses).
Compatible camera bodies are: K-1 Mark II, K-1, K-3 Mark III / Monochrome, K-70, KP, K-3II, K-S2, K-S1, K-3, K-50, K-30, K-5 II, K-5 II s, K-5, K-01, K-7, and K-r.
*When this converter is mounted between a 35mm full-frame SLR camera body and a DFA-series lens, the image size is automatically cropped to the APS-C format.

Weather-resistant, dustproof construction for active outdoor shooting
Equipped with three airtight seals, this model is the first PENTAX rear converter with a weather-resistant, dustproof construction. By combining it with PENTAX’s weather-resistant, dustproof camera body and lens, the user can assemble a dependable digital imaging system that performs superbly even under harsh outdoor conditions, such as in the rain or in a cloud of dust or sand.

Please find more information about the Lens specification in our lens glossary ... (link)