The Pentax 1.4x HD PENTAX-DA AF Rear Converter AW K-Mountfrom Pentax 1.4x HD PENTAX-DA AF Rear Converter AW K-Mountis compatible with Pentax KAF2 mount lenses on select DSLR cameras. It mounts between the camera body and lens, and increases the focal length of the lens by 1.4x, while reducing the aperture by 1 f/stop. The minimum focus distance of the lens is preserved, as are auto focus and auto aperture functionality. The rear converter works flawlessly with both the camera-driven AF system and the lens-driven AF system, including that of the SDM and DC-series lenses. The camera's firmware must be updated to the latest version before using the autofocus function.

PENTAX HD Multi-Layer Lens Coating    Weather-Resistant and Dustproof Design    Increases Focal Length by 1.4x    Reduces Lens Aperture by 1 f/Stop    Lens's Minimum Focus Distance Retained    Auto Focus, Auto Aperture Retained    Works Seamlessly with Camera and Lens AF

Treated with Pentax's exclusive multi-layer lens coating, which provides high light transmission and low reflectance for sharp, clear images free of flare and ghosting--even under adverse lighting conditions, such as backlighting.

Durable, weather-resistant construction protects the converter and the barrels of compatible, weather-sealed lenses. Shoot worry-free in rainy or misty conditions and when subjected to sprays or splashes.

Mounts between the camera body and lens and increases lens focal length by 1.4x (40%)--yet has a notably small form factor, measuring only 0.8" and weighing in at just 4.4 oz. This compact size allows you to reach out to distant subjects and capture blur-free shots more easily. Since the minimum focusing distance of the lens is retained, this converter allows you to get just as close as before--but with greater magnification for more detailed images. Keep in mind that when the converter is mounted, the lens's maximum aperture will be smaller by 1 f/stop.

Auto focus and auto aperture functionality retained when using the converter, which works flawlessly with both the camera-driven AF system and the lens-driven AF system, such as that on the SDM and DC-series lenses. The camera's firmware must be updated to the latest version before using the autofocus function.

The converter is compatible with Pentax KAF2 mount lenses. Autofocus is possible with lenses featuring a maximum aperture of f/4 or faster.

K-1 Mark II, K-1, 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.

The DA Limited Soft Case for the HD PENTAX DA and smc PENTAX DA 70mm f/2.4 Limited lenses is supplied. Also included are the Lens Mount Cap K and Body Mount Cap K.

Related Questions and Answers

Q: 1. does this work with HD Pentax-DA 55-300mm f/4-5.8 ED WR Lens?

A: Yes! I've shot some tack-sharp daylight wild animal photos with the Pentax DA 55-300mm/1.4x Rear Converter combo. Note: Since you'll lose an f/stop with the teleconverter, the combo will work best for outdoor tele-zoom photography in favorable lighting conditions.

Q: 2. How will this lens behave on a FF body like the K1?

A: The Pentax HD Pentax DA* 11-18mm f/2.8 ED DC AW Lens is designed for cropped sensor cameras only. The Pentax K-1 does have a cropped sensor mode so you could use this lens. You will only be using a small section of the sensor and will get a small file size.

Q: 3. Is the lens barrel (including the extension), made of metal or composite (plastic)?

A: The lens barrel is a combination of poly carbonate and metal.

Q: 4. THIS SHOULD WORK WELL WITH MY NEW PENTAX SMC DA 18X270 SDM LENS F3.5-6.3 ED, CORRECT ?

A: Checked the compatibility list that came with my DA 1.4x and it does not list this lens as either compatible or Not compatible. To be sure you might want to check with Ricoh, though it does work with the 50-135 and 55-300 so I don't see why it wouldn't. You also may have to update your camera to the latest software for autofocus function.

Q: 5. Is there a tripod collar that fits the Pentax 85mm f1.4 lens?

A: Unfortunately, there is no tripod collar available for the HD PENTAX-D FA* 85mm f/1.4 ED SDM AW Lens.

Q: 6. Is this lens made by Tamron (like the great 15-30mm)? Thanks

A: The Pentax HD PENTAX-D FA* 85mm f/1.4 ED SDM AW Lens is made by Pentax.

Q: 7. Is the focal length transmitted to the camera corrected? For example, if used with a 200mm, is the combination 200mm + 1.4x converter transmitting the info 'focal length = 280mm' to the camera? (Important for stabilization)

A: It does register if you use it with a Pentax lens. It shows 420mm with my DA*300mm F4 and 140mm with my Pentax 100mm WR. Not sure about the rest. Probably so if you you a fast lens. Dont know about non Pentax lenses.

Q: 8. Why does this lens have a M/A focus switch when the K-1 and K-1 II have already have that feature?Does this mean this lens is actually made by another manufacturer?

A: Pentax HD PENTAX-D FA* 85mm f/1.4 ED SDM AW Lens is made by Pentax in their Vietnam's manufacture. Many Pentax Proffessional full frame DSLR lenses has their own M/A switch to turned ON/OFF the lens build in focus motor.

Q: 9. I own a Pentax K-3 with several lenses. Two of them are Sigma's. I am planning to use this coverter on my Sigma 70-300mm F4-5.6 APO DG Macro. Is this a viable choice to extend my capabilities? Sharpness? Loss of stops? Thank you!

A: I use the converter with a K-3 & a Pentax 300 mm F4 lens. As everything is Pentax all the lens functions are maintained and the camera recognizes the set up as a 420 lens. The set up dropped 1.6 F stops. Images are tac sharp!

Q: 10. Has anyone tried this teleconverter with the K3ii and the Pentax 150-450mm zoom lens?

A: Yes, users say the teleconvertor will magnify any positive or negative issues with the lens. One reviewer says "I was still very impressed, based on my experience with my K1 plus DFA 150-450 mm". Knowing that this teleconvertor is made for crop sensor cameras, using the K3ii, the results will be even better.