Long tailed tits

I had the opportunity today to try out (again) a couple of telephoto lenses, just as I was about to order, I think, a 70-200 f2.8 Mk II lens plus x2 convertor! I'm glad I haven't placed the order, as the images I took at 400mm with a 100-400mm lens were noticeably (even on the LCD screen) sharper. None of these images is for a competition, but I thoroughly enjoyed taking them and learnt more again about telephoto photography.

The first three images were with the 70-200mm lens at 400mm (with the x2 convertor), the second three with the 100-400mm lens - again at 400mm. This natural history photography requires lots of patience! These small birds are rarely still when feeding young, occasionally hovering, and their calorie consumption must be huge.