Well I think I may need a 100-400 at some point in the future. I would like to do a cruse to the top of earth and then another one to the bottom. Since I can only each 105mm that's not going to be long enough.
But while saying that I am not looking at buying at the moment.
If you haven't used it that much you could always put it on trademe

The original 100-400 is my main lens - and for anything where you want reach to me it's a good all round lens. I've had mine almost 6 years now - and with the MkII available I'm probably going to upgrade - it's worth that to me, especially since the Mk II takes the 1.4x tele-converter well by all reports. MkI definitely doesnt.
Consider the Sigma 50-500 as well - it's very good for the $$ (my girlfriend has one). it does need a little more light than Mk I, and a bit slower at focusing, she's getting a better keeper rate than I am at the longer ranges.
Of course it helps I'm earning USD, which takes the sting out of the pricing of the MkII.
Daniel
I have no complaints about the performance of the 100-400L, I have shots I love, the waterfall series back a page being some. The problem is I over estimated my own physical capabilities and did not have a 'hold' when I bought so I got a bit surprised by the bulk and weight for me to hand hold. I don't intend to sell as yet. It is a good lens.







In fact I have scenes only from NZ.


