Thread: Canon EF 100-400mm f4.5-5.6L IS USM
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Old 23 Nov 2010, 22:20 (Ref:2794916)   #23
Woolley
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I use a 70-200 f/4 with a 1.4 converter (Sigma) and it's fine. f/2.8 is better - I've seen plenty of pros using them, but don't be tempted to use a 2x converter which slows autofocus below a useful point.

If you're looking at a 2.8 + converter but put off by price and weight, the new 70-300 f/4-5.6 IS might be a viable alternative?
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