Pentax 1.4X AW HD PENTAX-DA AF Rear Converter-black

This converter is designed for Pentax APS-C cameras but can be used with full-frame. It allows all automatic functions to be used. The attached photos were taken with a K1-II camera body fitted with an HD Pentax-D FA 150-450mm F4.5-5.6 ED DC AW telephoto lens at full magnification. The fourth photograph clearly shows the vignetting that occurs when used with a full-frame camera, but that can be cropped out. There is no vignetting with an APS-C camera. For me, the colour and clarity are good and I am pleased with the purchase.

I take a lot of wildlife pictures especially birds and felt that this might be a useful addition to my 150-500mm lens. It has so far produced good results, the only drawback being that if you are lucky enough to be quite close to the subject then Minimum focus can be tricky to achieve. That apart though I've taken some great photos over the last few months and it's not been OFF the lens more than once.

I use the lens permanently attached to an f4 300mm lens . This makes the f4 into a 420mm f5.6 lens. OK, you need one extra stop, say 800ISO to 1600ISO........question is does the extra magnification outweigh the grain verses magnification??......You can take a photo at 300mm and enlarge the image, [I almost always crop anyway]. but its my opinion that the extra grain at moderate ISO's is better than enlarging the 300mm image. I always shoot at the lowest possible ISO, to minimise grain.My target is birds and wildlife.The auto focus is unreliable through vegetation, so I use manual focus.There is no apparent loss of definition or any other degradation. So with the Pentax lens at £900 and the converter £350, for £1,250 you get a superb 420mm lens from Pentax.....good.

This is in my opinion is a must have accessory for any Pentax user who needs that extra reach with their glass, whether it be for sports, wildlife or macro. Build quality is excellent and incorporates both SDM (silent focus) and old fashioned screw drive and as an added bonus its weather sealed as well (With appropriate lens and body) and it works well as I've used it in the pouring rain without any problems whatsoever, I was the one that suffered but that's a different story The only downside is a loss of one stop of light and focusing issues with lenses slower than F4.All in all worth every penny.Matt.

Used for bird photography e.g. kingfisher. Doesn't work well in low light conditions. This is using a Pentax K70 Camera and a HD Pentax DA 55-300 ED PLM WR RE. Found that the image was not really sharp in a lot of cases. For the price, I don't think it is quite worth it. For the light at this time of year (December), I would suggest just using a 300 lens and bracketing the subject.

Does the job well with Pentax lens. It leaves my Sigma lenses hunting for focus, which is a bit of a pain

working well at the moment but well update after a few tests

The converter arrived on time and well packed via Royal Mail.All the functions of the excellent Pentax system are supported and it gives an increased reach with my 300mm Pentax lens.