Well, I'm back in the game. Picked up a refurbed 80D to replace my drowned one. No I'm really struggling to determine what lens I want. I do a mostly nature/wildlife and then when the airshows come I make sure to go and get shots from there. I'm considering either a 70-200 with a 2x tc or a 100-400 with a 1.4x tc. I can't afford the canon lenses so I've been looking at the Tamron versions of these.
If anyone has any experience with the Tamron combinations on their 80D, I'd love to hear about them.
Harry: I have a Canon 100-400 II, which I love but, yes, it was expensive. I'm so glad I broke the bank to buy it, though. However, while I don't own any Tamron lenses, I can tell you that Canon Photo Plus magazine here in the UK tested eight telephoto zoom lenses in its latest issue. The Tamron SP 70-300 f4-5.6 DI VC USD didn't win overall but it was the Best Value winner. Costs £330/$450. The overall winner was the Sigma 70-200 f2.8 EX DG OS HSM at £900/$1,300. The Tamron was given four and a half marks out of five, while Canon's EF 70-200f4L IS USM, costing £1,100/$1,150, was given only four stars out of five. Don't think Canon will be too pleased with that result. Hope this helps and good luck with your quest for a new lens!