Have you looked at the Lupo range of continuous from Damien LoveGrove,

I've found them excellent for a number of tasks and would think one would be good for you, they are not cheap though.

No problem, in hand and being sorted next week,

I spoke to an excellent technician in their Service dept, he's put aside the mounts for me and I'm delivering them on Monday. They've not asked for Proof of Purchase ready for a shoot next week and the Machloop the week after.

Thanks Joostdh

Appreciate your post, its one of those things where after looking at all the reviews, taking into account comments from PU where the camera's been used a fair bit now, its several months since its release where you have to take a leap and go for it or stay with what you have and accept the limitations.

What I'm likely to do is downgrade the K5iis to the misses, she shoots as well, but not to the extent I do and have the K5 she uses converted to IR, its not worth much on the market and I fancy some IR stuff having seen what a fellow photographer has produced that I shoot when we've been working together.

I'll probably take the K1 and K5iis to the Machloop and shoot with both the Sigma 70 - 200 and 150 - 500 on both as a non technical comparison and I've the 100 - 300 F4 to play with as well.

Thanks John,

I was trying to shoot some Red Kites at the weekend, and with the Sigma 150 - 500 it did hunt a bit, going up the Mach Loop again in a few weeks and whilst the K5iis has produced some excellent stuff, that tad more focussing accuracy and speed will be most useful. The Sigma 70 - 200 was also good for the jets but need that extra bit of reach at the top of the hill.

I think I'm pretty much decided to go for a K1 next week

Thanks Joostdh,

I've a mix of FF and crop glass so, my sigma 17/70 walk about lens is a very well used and bettered ( dropped, but still works ) so I can see that being replaced at some time. What's your opinion on the focussing speed, better than your crop bodies or same ?

I don't have a problem with its size, it'll be smaller then the 645

Wow, these are superb, especially hand held, the flash would have helped freeze the subject, but still very impressive.

Thanks K10D,

I'm in two minds whether to upgrade from the K5iis to a K1, don't particularly need the full frame format as the 645 is used for landscapes, portraits etc,

From a bird in flight shoot at the weekend, if the K1's focussing response is faster, which from comments on this thread and others I've looked at back that up, I wished to seek an opinion before finally making the choice to upgrade.

Hi Stuart,

I use back button focussing ( AF set to C ) with a single point, takes a little getting used to, basically its a case of holding your thumb on the " AF " button on the back of the camera whilst having your trigger finger primed and ready to shoot, track the birds as normal and fire when ready.

Its worked for me on birds in flight and fast jets on the Mach Loop

Superb, thanks for the comment's and straight yes's so far

Would u upgrade from a K5iis to a K1 straight yes or no please based on performance.