Kris, I'm sure that if you took the motor out it would solve the jamming and would probably be better for MF use the trouble with a good version of this lens is that you can't disengage the AF motor so for MF your actually hand cranking the motor through a gearbox or similar drive.

The lens itself is very good optically, so good you don't need to stop it down.

The Expodisc works quite well. Just tried it outside, sunny day pointed at the sky, it got the WB spot on. For exposure I had to dial in +0.5 stop. The camera's AWB through the Expodisc was also spot on (probably using the same camera program). Set to Daylight WB on camera had too much blue, which might be why some non-Pentax lenses show a blue cast.

The Expodisc gets the full frame to the same shade of grey which isn't possible with a grey card. Still worth including something grey in the first shot.

Sorry to hear about Solomon Burke, one of the first Soul artists I ever heard on vinyl. Still got some of his LP's.

It works OK in camera. Unfortunately it doesn't tell you what value it's set to so that you can later set in manually or check if it coincides with a pre-set. I'll have to see if I can use it with external flash.

This video shows how to set a WB in Camera Raw from a 1st frame taken off a grey card or Expodisc and then apply it to the following images. Quite good.

I seem to remember reading that, I'll have to have a look at the manual for the K20D. It must be 4/5 years ago that I bought the Expodisc and basically gave up with it when I found that there wasn't a button like the green button to set the WB.

Just gave it a quick try and for exposure it works OK and I managed
to set the WB manually.

Quite a few videos on youtube about Expodisc, but non are Pentax related.
This one's quite good.

If anyone likes Motown it's on Smooth 'til 8pm.
Plays through Flash Player also Tony Blackburn
Podcasts on the site. I don't normally listen to
it (can't stand the adverts) but the Motown Shows OK.

http://www.smoothradionorthwest.co.uk/

I've got a Flavia machine, takes about 5 seconds.
Their coffee used to be brilliant years ago, but
tastes pretty horrible now. You probably came
across them in the restaurant trade. Owned by Mars.

I prefer Monsooned Malabar from India hard to get nowdays.
Sainsbury's used to stock it, but then again they used to
stock Jamaica BM as well.

This threads a year old

Stefan, I like the Pantone/x-rite stuff and it looks better than just WB alone. The page it suggests looks good and shows how to balance up the full range of greys.

Right from day one video cameras had a button to set the white balance. You just pointed them at what you wanted to balance to and that was it. Pentax cameras don't seem to have that although the *istD might have had it. So screwing a filter on is not much use. I might try it and take a shot and then manually adjust for the next shot it might work?

Brilliant I would love to watch a Deer rut, but don't fancy travelling to London.
I think there's on in Cheshire, I'll have to make enquiries.