Still darting about

(I realise that I've probably got these two images the wrong way around as the extra is actually my favourite of the two - see what you think).

I'm playing with lenses at the moment.  The darter on Wednesday was taken with a 105mm macro, yesterday's was with the 70-200mm f2.8 telephoto  and today's two shots of the same insects in the air  is with a 400mm f4.5 prime telephoto.  

I was mainly doing this to be able to compare the bokeh (out of focus elements) of the 3 lenses.  The shots I've blipped weren't necessarily demonstrative of that.  

But one unexpected result of my little experiment is something that I probably had recognised previously but only really appreciate now that I've used the 3 in conjunction with each other -  the 400mm is by some considerable way the quickest focusing of the 3 lenses.  That's not unexpected given that it is a prime lens.