I've got the Canon 1.4 and use it with my 100-400mm lens but, as I said, still not enough for 'planes - or birds, really.I'm using a full frame camera which is not helping - if I had a cropped sensor the set-up would be more effective. Expect you know Canon also do a 2x extender, but it loses more light of course. Extenders can also cause a loss of auto focus, so be aware. I don't have experience of other extenders, but there are quite a few available - try one first if you can.
viscountdriver wrote:
As you say, air shows are difficult but I think you are too hard on yourself.My computer screen needs replacing so I may not see the things you do but to be honest if I took those pics I wouldn't be too umhappy.
I'm thinking of buying some extenders are they any good?
Cheers
Gerry