Thanks John, I've just ordered a Hoya to see if that makes any difference. If it's the same I think I'll give it up as a bad job, as the 55-300mm is very good without any help.

link

Regards
David

John

It's not the autofocus that isn't working. The autofocus still operates fine. The issue is that whether focussing is manual or auto, you cannot get an image that is sharp. All images are blurred, whether they are in critical focus or not. The polariser is having some sort of combined effect with the lens to produce this issue. The filter in itself is clear as a bell and works on other lenses.

With regard to the need for a polariser on this lens, I intend to use it sparingly, but I do sometimes take landscape shots with the 55-300mm and it would help to ensure the saturation in the skies is good and to empahsise cloud structures.

Regards
David

Get Sanyo Eneloops - don't bother trying other brands as the Eneloops are well known to work brilliantly with the K-m, K-x and K-r. I tried many other brands as we already had lots of ni-mh batteries lying around, but none were any good, even those of 2500mah or higher. The eneloops are the D's B's and last for ages.

Hi all

I'm sure others have experienced the issues I am having at present. I often use polarisers, but have only recently bought a 58mm for my DA L 55-300mm. I have found it useless as the lens focus is so soft with the filter fitted that the pictures are not worth keeping. This worsens the longer the focal length gets. I've tried the filter on shorter lenses and it seems fine. I've also confirmed it is a circular polariser and not a linear one by dong the 'eye and mirror' test. The filter itself looks perfect when viewed with the naked eye (no blurring) it is only when on the 55-300 that issues occur.

Doe anyone have any suggestions for a reasonably priced circular polariser for the 55-300mm that works well without the focus issue?

Thanks in advance
David

Always use the back AF button for focussing, never the shutter button. Mostly AF-C now due to the increased control you get by back-button focussing. For Macro, almost always turn off AF and focus manually.

Regards
David

The +/- button allows you to set exposure compensation via the thumbwheel with an automatic lens fitted, but with a fully manual one it makes the camera perform stopped-down metering and sets the shutter speed based on the aperture you have selected.

Regards
David

Buy it!!!!!!!!!!!!!!!

I have the 28mm f3.5 Pentax-M and it is a great little lens. I don't have the 50mm f1.7 but I've read good things. Most Pentax lenses are really good.

Your comments on how to set the shutter / aperture are correct, but also as mentioned earlier, you can get the camera to set your shutter speed by pressing the +/- Exposure Compensation button (then adjusting it from there with the thumbwheel if you wish).

Regards
David

BTW Woj, sorry about my mistake, I didn't spot that you were the same 'newbie from stafford' that uploaded the 'Woj' picture! Makes me look a bit daft!

Regards
David

PS - what makes you think the image quality of your 28mm is 'pretty shocking'?

Kris, my K-x seems pretty good at metering with the manual lenses, most exposures come out spot-on. I always use the Exposure Compensation button as pressing this carries out the metering and sets the Shutter Speed.

Regards
David

Woj

Most of the photos uploaded are 'edited a fair bit'. There's no reason for this to be seen negatively and there are no rules about this. Take a look at the portfolio of Morpheus71 - if processing were not allowed we would be robbed of images like these!

Regards
David