For anyone intrerested, I emailes Sigma a month ago about this lens and they said it would be released in Pentax mount but had no date.
I emailed them again yesterday and just had a reply that they will be releasing the date at Photokina in September.

To be honest I just don't liker making offers. At the end of the day the person selling has an idea in their head as to what they will accept so I would rather just know that from the beginning.
It saves unnecessary messing around imo and is actually part of the for sale process on other forums.
From there people have a baseline from which to make an offer if they wish.

How much for the grip?
Dont like to make offers as it usually offends

I have the cash but don't want the 55-300mm, I'm quite happy with the Sigma 135-400mm for the moment.
The money is going towards the fabled lesser spotted DA* 60-250mm F4 should it ever appear.
But if I can make a few quid (or should I say Euros now) by buying a 80-320mm cheaply and reselling it on Ebay then I am always happy to do so

Im quite tempted now ... is it black or silver?

It's all in the presentation, if you need help with the photos let me know

And the 80-320mm went for £150 plus postage

First and second ones - Tamron 70-210mm f3.5
Third one added the 01F Tamron 2x teleconverter.

Will be vary interested in that, I am keeping my 1.4x MC4 purely because of the 60-250mm DA* so it may never really get used.

My problem was the lock on, the lens (Sigma 135-400mm DGA PO) would hunt a bit before getting the initial focus and by the time it did the bird had gone. I cannot put it down to a light problem either as it was probably a bright a day that you are ever likely to get in Spain so I must put it down to the lens or the camera.
The times where I did manage to lock on the bird (AF.C and auto select) it was fine and would track with no problem and the shutter would fire straight away.

Anyway, that's the K10D, not sure if the K20D is faster but I do know that when I get it right (not that often) the pictures look as good, if not better than anything produced by a Canon or Nikon.

One of the shots I took just to show it did actually work sometimes