Well I'm finally just about able to get into the market for a long zoom lens for my Canon EOS-350 having saved up the pennies over the summer. I'm looking very closely at the Sigma 80-400 OS but I'm quite concerned about possible slow focusing due to the lack of HSM motor, does anyone have views on this... any hands-on views would be very helpfull. The Canon 100-400 L IS looks the business and seeing the results people like Johndm are getting with it confirms this, but I'm afraid the extra £300 over and above the Sigma's price of £600 or so (yes, ebay prices) is just streching too far for me. As for what I'm intending to shoot with it... Well, due to the girlfriend's love of horses (and her having her own) I'll be dragged to every local horse show to take her and her horse's picture, and every big horse show to take everyone else's picture, so super fast focusing isn't the order of the day here... but I wouldn't like to be held back too much and would hope that the lens would cope reasonably well with motorsports, wildlife and the odd airshow. All things image stablisation would come in very handy for, which is why it's such a big selling point to me. Am I hopeing for too much from this lens? All opinions welcome, thanks. Regards, Iain.