« Reply #11 on: 13 April 2013, 17:10 »
70-200 f2.8 used (£700ish) + a 2x teleconverter. So you'll have 70-200 at 2.8 but of you need the reach you'll hav 200-400 but 5.6 same as the 100-400L. The TC will take 2 stops of light.
I find my 70-200 f4 long enough with my 1.4x teleconverter but then I don't do much long range stuff.
As the 600D is involved:
All in mm
1x 1.6x 1.6x2x
70 112 224
100 160 320
200 320 640
400 640 1280
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