• UPDATE



    The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being.

    I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure.

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From time to time, I find shooting either distant wildlife (mainly deer) or motorcycle racing and coming up wanting to have more reach than I have today.

Today, I use a 300mm f/2.8L II + 2x TC III on either 5D3 or 1DX (Mk I), so this is my baseline.
I also have the 1.4x TC III, so this in combination with a lens is definitely a possibility.

Without setting a budget (I'd have to save up anyway or possibly rent the lens the few times I'll need it), I've been consideringthe following:
- 100-400mm f/4.5-5.6L II (+1.4x TC)
- 200-400mm f/4L 1.4x EXT (+1.4x TC / 2x TC)
- 600mm f/4L II (+1.4x TC)

I can see that the 'weapon of choice' among pro racing photographers is a 600mm+1.4x TC, but (A) I'm not a pro and (B) I'm a bit concerned whether I'd find the prime being less practical than a zoom. However, I see Eldar (and Edward too?) saying that they use their 600/4 much more than the 200-400/4.

For motorcycle racing the 1DX would be used, but for the wildlife the 5D3 also comes into play. Either case, both will only focus to f/8 at the center point.

The Tamron & Sigma 150-600mm end up with f/6.3, so I'll loose AF with an extender at the long end.

Are there other options I should consider? Manual focus is a no-go.