Use Catch in Focus with your tubes instead of AF. AF will continually move out of focus whereas with CIF you control the shutter release. With a set it tubes your DOF is going to be too small for AF to work properly. At least with CIF you can gently creep closer to the point of focus and once achieved te shutter will release automatically. Much more successful for really close up work than AF.
I once had a shoot with a guy with a Nikon D3 and a Sigma 105 attached to it via a set of Kenko AF tubes and I had way more success in getting my shots in focus than he did by using CIF. He was very complementary about my K-5(iis) BTW. 😃

A big thank you to all.
As I was processing the shots the story was building in my mind. Glad so many enjoyed it. 😃

Aw shucks, thanks everyone, it's really nice to get positive feedback 😃

No, I haven't bought the K-3 grip yet so not a factor.

Cheers guys,
Barrie, I was using my K-3 and DA*300 + 1.4x HD TC

Same here, while shooting the karting in continuous shooting mode too.

1. Is that... it is, it's a Pentax



2. Hey everyone there's a Pentax over here!



3. Hey, what's all the fuss?



4. It's a Pentax? cool, I'll tell everyone



5. GUYS, GUYS There's only a bleeding Pentax over here! LOOK



6. I don't believe.....



7. ... It is you know



8. Let me use this trampoline to get a better look



9. Bah Pentax schmentax, Canon are the best



10. What did he say!



11. Oh no, what did he go and say that for



12. Nikon are best!



13. No they are not, Canon are



14. Come on you lot, break it up. Now kiss and make up



15. I'm sorry



16 Yes me too



17. OK now that's over I'd better clean up the mess

Not this year, but we did have The Shamones, The Stereotonics and Oasish at last years' event

Great work as usual Doc. I love the first one, great timing to get the plane right between the spreading lines. Like the gherkin shot and the cranes too.
They are all good but those three really stand out for me

No but I am going to GlastonBarry. My son's band are playing