If you live in France you only deal with any customer services department as absolutely a last resort.

I can't open your link I'm afraid. My jpegs look quite different from my PEF's. In my Jpegs I can see individual pixels. In my PEF's I can identify larger squares each one containing 64 pixels, I think.

I sent it back once, together with a printout of the forum discussion here which lead mostly to sensor replacements and lots of samples. Slightly awkward for me as I live in France so I have to find someone to take it back to the UK then to Pentax then back to someone in UK then back to me. Can take ages.

Would someone be kind enough to send me a PEF file please so I can see what one should look like?

Here's one. It doesn't happen on every shot. But it happens a lot - sometimes 10% or more. I can take one shot without banding and an identical subsequent shot with banding.

[IMG]http://i136.photobucket.com/albums/q185/adrianpmills/IMGP1384.jpg[/IMG]

My K20D has the same vertical banding problem which has been discussed in another thread. It went for repair (circuit adjustment and firmware upgrade) but it came back with the same problem, so it's going back again.

Would some kind soul be willing to send me an unaffected K20D PEF file please so I can compare it with mine? Preferably something with a bit of light and shade. I can't tell whether the banding problem affects only certain shots or whether it introduces noise to all shots but is more pronounced in certain ones. There don't seem to be any unique conditions under which the problem is created. It would therefore help to see what a trouble free file looks like.

Thanks. I can PM with my e mail address.

I got a Pentax 50mm f1.7 M for £9.50 recently from eBay. And it's excellent.

Understood but I personally found this information invaluable - I grabbed one of these and I am really pleased. I wouldn't have been able to find one otherwise. The same applies to a similar, recent thread for a battery grip.

Thank you John X.

I got mine - an official one a few weeks ago before the price went up from £22 to £65. At the current price I would be scouring ebay and anywhere else for any old stock.

I bought a lens recently at Chiswick cameras but the shop had run out of K adaptors. The very nice chap there told me that SRS had some left so order one quick as Pentax were putting the price up. I'm glad I took his advice - 200% price rise.

Since I don't know - I got one a few weeks back for £22. I don't know what PU is. But, unless I've got the wrong end of the stick:

http://www.srsmicrosystems.co.uk/156/Pentax-Mount-Adapter-K.html

And the price has just gone up from £22 to £65