It looks new because apart from this one instance where I was jogged as I took the picture at the Tower of London, I look after my kit and as I had quite a few APSC lenses for my K3, none of them were used to any great extent. The third picture in Traflagar Square was taken after the lens was marked and as you can see the marks have no effect on the image. I do not think that I can improve on the images of the marks, as you have to look carefully to see them. I attach 3 further general pictures of the lens. I would happily have kept it, if I still had an APSC camera because it is a useful walkabout lens, but it vignettes very heavily on Full Frame. I have to declare the marks as a seller, but as a user you could happily forget about them and enjoy the lens at what must be a bargain price.

I am selling last of my lenses not compatible with K1. It has two small marks, neither of which show on images. They are hard to see and even harder to photograph.
Otherwise the lens is unmarked and not greatly used. I found it a capable and useful lens and am offering for £130 including RMSD to reflect the two small defects. It has Pentax front cap, lens hood and generic back cap. I bought it unboxed from SRS in 2013.

I had this lens and it worked well on my K1. If there was any vignetting it was not not noticeable. I sold it to buy another lens which would be of greater use to me but this lens is a gem if you want that focal length.

I got a reply from the author ( Andrei) who e-mailed what looked to be an identical file to be put in the program's root directory. Anyway after I overwrote the original one, the demo works fine and I can now access both curves and channel mixer. Thanks so much for your help.

Thanks Barrie, Yes you are probably right. It looks to me that the demo version is possibly too limited to show the full potential. I will see what reply I get and may well hazard my £13 anyway - it is pretty small beer after what I have spent on gear this year - K1 and lenses!!

Thaks so much Barrie for taking the trouble to show me. I have no problem in locating the elements + icon but when I click on it, I do not get any of the nine tools which your graphic displays and the elements dialogue box pops up, but neither channel mixer or curves appear when you click on their names. I think this is because they have simply not installed themselves. I have reinstalled elements+ and there is no change so finally I have emailed the author to see whether he can help. It seems a very useful program but I shall not spend even £13 until I know it is going to work on my PC . I wonder whether windows 10 has anything to do with it.

Thanks the the instructions led me to think that you brought up the curves dialogues by clicking on the elements + panel - this works for the effects but nothing happens when I click on the curves or mixer words. I have now found the curves dialogue under the adjust colour tab but still can not find the channel mixer anywhere!

Thought that Elements + looked interesting, and I downloaded the appropriate version for PSE 14 and although some of the effects seem to work OK, I have been unable to summon up the dialogue box for channel mixer or curves as nothing happens when I click on the appropriate tab. Clearly I am doing somethhing wrong but the on-line guidance has not helped me.

I have seen positive comments from owners of the 16-45 but it has long been discontinued and I would have thought that the 16-85 ( which I do possess) was in an entirely different league . It is WR, covers a greater range and is pretty sharp across the frame and I have the impressions that most owners of this lens are delighted with it.. I would think that a SH copy of the 16-45 would be much cheaper, but you get what you pay for. You could however be happy with it.