spray a small (tiny!!) amount of silicone spray onto a cloth and wipe around male thread. screw into female to transfer to that thread and give a few forward/backward turns.
I use wd40 branded silicone spray, from screwfix.
this...
http://www.screwfix.com/p/wd-40-specialist-silicone-lubricant-400ml/86394?kpid=8...

Sold, paid for and dispatched to Brian.
Many thanks.

still for sale.

you have a pm.

Bump.
£400 delivered.

for sale is my k3. i bought this a spare/back-up, but in truth, i don,t need two bodies so its hardly been used, therefore in as new, mint condition. it has a shutter count of only 2925.
it is fully boxed and comes with everything as it did from new, except the leather strap lug covers.
looking for £410 (£400 for camera and £10 to cover delivery by RMSD).
payment by paypal (as gift) or bank transfer.
any further info please ask.

Hi all.
I have a sigma dg 150 - 500mm f5-6.3 apo hsm, which wont auto focus properly.
It has been fine up till this week (i dont use it very often though), but all of a sudden it seems to be really hunting for focus, then when it stops hunting, subject is not in focus....nowhere near!
I use it on a k3, and it does it on both k3 bodies i have, so doubt its the camera, and all my other lenses are fine. Batteries were fully charged.
Anyone else had this?
Any advice?

Thanks,
Simon.

I would have no hesitation recommending the 18 - 135....mine virtually lives on the camera. I bought mine new, but check the classified section on here, they come up every now and then.
I must admit that prior to purchase i was slightly put off by some reviews, but in contrast, actual user reviews were very good. I would put myself i that "actual user" group now, and i think its a great lens.
My advice would be to buy used, then if you dont like it, sell it on for what you paid....nothing to lose.

Aaaargh, was gonna pm you about it earlier. If it doest sell, give me a shout.

Does shooting raw + jpeg make a difference?
I thought it would still be x1 shutter actuation.