I have the same problem", my Sony a9 and 200-600mm does everything I need (although no camera is perfect and I would like another 10 or so MP) and it works very well with my Canon lenses using the Sigma MC-11 yet I just can't bring myself to sell the K-1 and 150-450mm, this is despite the fact I curse the AF tracking nearly every time I go out with it. The thing is when I do get the shot with the Pentax the IQ just looks so much better than from the Sony or Canon (To me at least).

Just had an email from Ricoh UK about the lens, straight Euro to pounds conversion again ... £1499

Lost count of the number of times I have done that and ended up binning it in a fit of temper.

Up until the K3 (3) imo Pentax autofocus/tracking has been pretty average at best and that's putting it politely and as far as I am concerned the jury is still out on the newest camera.

When shooting birds with my K-1 i use back button focus, single af point, average exposure and AF.C, multiple point is next to useless.
If you use spot exposure you will nearly always get a blown sky in the UK (same with airshows) but at the end of the day it's the detail in the bird you are after not the sky but using average normally enables you to pull more in PP.

I would also be shooting wide open and a faster shutter speed with Kingfishers, they are twitchy little buggers.

Also turn OS/SR off at those shutter speeds if you have it on.

I saw that, thought about it for a bit but the comments on Pentaxforums weren't very encouraging

I wanted a small pocketable camera and ended up with a Sony RX100 V off eBay. Lovely little camera but far too tiny for me so I sold it elsewhere for substantially more than I paid

It took me years of waiting

A good start, the Kingfisher is possibly my favourite bird and whenever I see one all my camera knowledge seems to go out the window and I end up forgetting my settings and just shooting.

I now have a Sigma 150-600mm Sport on another system which is a touch over 3kg but I used the same Sigma 50-500mm you have when I had my K-5IIs. Here is a Kingfisher I got with it LINK

I remember when Chris would come on the forum and tell us about deals like this himself.

Anyway, as per title SRS are giving an extra £100 against PX on the K-3 (3) if anyone is interested.

I can help you with that problem LINK