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Get a crop sensor camera and enjoy your 200mm at 320mm 

The 400mm F5.6L lens never really appealed to me because of the lack of zoom and lack of IS but since then I've seen the kind of shots it produces and when you combine that with the size/weight, it does make me want to try one hehe.
The 100-400mm mk2 does cover the same focal lengths that you have but it'll probably be stuck at 400mm when you're using it anyway hehe![]()
Get a crop sensor camera and enjoy your 200mm at 320mm![]()
That's the thing isn't it
When would I need it lower than 400?
Of I did I'd have the 70-200 with me worth 1.4x and I'd nearly be all the way there with f4
As this would be for flighty wildlife (ie birds) and we live in dreary England I don't think f5.6 is enough.
It's dark in woodland
Does it seem like it's 400mm DO or bust? It seems like it.
Maybe there really isn't anything light and cheap enough in this area when I have a 70-200?
Yeah the 400mm offerings aren't plenty or cheap. The 100-400mm is mostly going to be used at the long end like my 200-400 but it's nice to have the flexibility.
400mm DO2 is a very nice option but priced accordinglyBut even then, you'll likely want more range sometimes so you might end up sticking a 1.4x on there and getting F5.6 anyway?
I guess my point is, unless you plan on getting a 400mm F2.8 or the 500/600mm F4 lenses then you better just get used to the idea that you'll be working at F5.6 quite a lot. Those wild animals are rarely considerate enough to let you get close![]()
To the OP, if you're not in a rush to get a lens in the 400mm+ bracket, it might be an idea to wait a little.
There are rumours, that Canon might release an EF 200-600 f/4.5-5.6 IS Zoom in the Autumn.
http://www.canonrumors.com/canon-to-release-super-telephoto-zoom-in-2016-cr2/
http://www.canonrumors.com/more-canon-super-telephoto-zoom-talk-cr1/
It would make sense, since Canon is lacking an affordable zoom in that range and I suspect they might want to mop up the Tamron and Sigma sales.
I just ordered the sigma 150-600mm Sports. I'm doubting a canon version would be much better TBH. The siggy is very sharp and focuses extremely quickly and reliably. Plenty of people have compared it to 400/500/600mm primes and it stacks up very well.
• Nikkor 600mm f4 VR: 67 images captured. 56 (84%) very sharp; 7 (10%) moderately sharp; 4 (6%) soft. This means 63 of 67 (94%) could be classified as keepers.
• Sigma Sport 150-600mm: 67 images captured. 18 (27%) very sharp; 23 (34%) moderately sharp; 26 (39%) soft. This means 41 of 67 (61%) could be classified as keepers.
• Tamron 150-600mm: 65 images captured. 1 (1.5%) very sharp; 23 (35%) moderately sharp; 41 (63%) soft. This means 24 of 65 (37%) could be classified as keepers.
• Nikkor 400mm f2.8E VR: 65 images captured. 46 (71%) very sharp; 15 (33%) moderately sharp; 4 (6%) soft. This means 61 of 65 (94%) could be classified as keepers.
• Sigma Sport 150-600mm: 65 images captured. 31 (48%) very sharp; 23 (35%) moderately sharp; 11 (17%) soft. This means 54 of 65 (83%) could be classified as keepers.
• Nikkor 80-400mm: 63 images captured. 28 (44%) very sharp; 24 (38%) moderately sharp; 11 (18%) soft. This means 52 of 63 (82%) could be classified as keepers.
• Tamron 150-600mm: 66 images captured. 13 (20%) very sharp; 37 (56%) moderately sharp; 16 (24%) soft. This means 50 of 66 (76%) could be classified as keepers.
413x, I would wait and see what turns up. Judging by Canons recent offerings, both in L and non L lenses, it looks like they've made some nice improvements to their optics.
I came across this earlier
http://www.mir.com.my/rb/photography/companies/canon/fdresources/fdlenses/fdzooms/150600.htm
Looks like Canon have produced a 150-600 f/5.6 L lens in the past albeit for the FD mount and L series.
Interestingly it had less elements and groups than the modern Sigma 150-600mm F5-6.3 DG OS HSM Sport and still managed to be a constant f/5.6, quite some achievement considering when it was released.
Problem with Canon is that their lens design isn't what is holding them back, it is their conservatism. Contrast this with Sigma, who do take some bold steps. Sigma are a family run company and their CEO Kazuto Yamaki, from interviews I've read with him, is quite a refreshing change from the usual Japanese corporate figureheads.
Canon really do need someone like Kazuto Yamaki to make those bold moves.
Interesting find, love that website. That is one funky zoom mechanism!
I still stand by my assertion that 150-600mm f/5.6 is unlikely purely due to the size, weight and cost with bracket that canon would be aiming for if you believe the rumour. Of course the rumour could be wrong and canon want to push a model that is higher end and more expensive than the sigma sports. I would have happily paid 50% more than the sigma sports for a Nikon lens to 150-600mm f/5.6 with Nikon's best AF and greatest optics. Heck, even a 600mm f5.6 prime for $3000 I would snap up.