I took the photos below over 3 years ago with the 100-400/1DMkIIN combo.
That was my first 100-400 copy and of average sharpness.
It was a bit of a struggle to get those images, especially once focus was lost there was no chance of recovery within the short time window of opportunity.
At that time I did try 300 f/4 IS and 400 f/5.6 IS, and both lenses were a bit better at focusing speed.
All I can say is that 100-400 can obviously do the job, and in those instances where zooming action is required the lens becomes just about the only option.
However, if I wanna maximize my chances of getting a PIF or a DIF shot these days, I invariably take 400 f/5.6 or one of the 200mm or 300mm fast primes.
Jul 04, 2009 at 06:20 AM
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