http://www.photographyshow.com/diyframingexhibs/

but the only one you need to know is Pentax = C111

The clamp is purely there to stop any focus shift in manual focussing mode, especially in circumstances where gravity might play a part, i.e. if using a copy stand so the lens is pointing straight down.

Set to manual focus, adjust focus, switch clamp 'on' to hold focus. That's it.

DON'T try to change focus when the clamp is 'on'.

My cash-back appeared in my account today, having sent in the claim on 22nd January. No sign of the FluCard as yet.

Am chasing/badgering the marketing firm that are managing the promotion for Pentax directly; they don't like it up 'em Mr Mannering!

Welcome! If you haven't yet done so, take a look at Pentax DSLR's; you'll be pleasantly surprised!

Shame these aren't produced by Pentax, but there are quite a few marque agnostic tips that might be of interest.

link

That's exhausted all my original thoughts for 2015 then Unfortunately looks like the lens will be off to Tamron for service

The thread dates back to 2010 guys! Doesn't make recent comments less valid, but...

I'm sure you have, but have you checked the focus limiter button?

New month, new bump.

Covers arrived today, thanks, and fit all the batteries I've tried them on, including third party ones.

For the record, I have D-Li109 batteries from DSTE - perfect fit - and some 'no name' D-Li190 - good fit - in addition to actual Pentax batteries in both sizes.

I'm sure I also have a Hama D-Li190 somewhere. I'll report back once I find and try it.

Any chance you'll me making any for the D-Li150 battery?

I'm very happy with the covers Andy; well done, but have one suggestion. The covers fit very well, and I was wondering if a thumb-hole in the base of the cover (obviously not exposing the contacts) would assist removal? Hopefully the hole wouldn't weaken it.