I have been using it on holiday in Cuba and found that I could use it hand held for butterflies and Dragonflies. I may find I need to use a tripod in the UK though

Pete
I think it is - and keep the 300mm on for walkabout (with/without the 1.4x). Use the 100-400mm for when I'm shooting commission stuff when I need that extra flexiblity - or really need that exta bit of reach. But I'm rapidly coming around to being a prime person - prefer the sharper shots and the compositons become more challenging!Gruditch wrote:I have heard before that the 300mm F/4 is sharper, but against that, the 100-400 has a bit more reach, I could however use a 1.4x extender and get to 420mm with the 300 f/4 but would it still be sharper than the 100-400 ?