Should I purchase a 300mm f/2.8 is I for wildlife???

takesome1

EOS 5Ds R II
Aug 23, 2013
1,448
80
But also, don't f4 lenses focus faster than f5.6?
Not necessarily. It depends on the lens.
With the 500mm F/4 the lens may be moving more mass inside.
Battery power, (other bodies vs the 1D line) seems to matter more for speed on the bigger lenses.

One stop is an 8 to 10 minute advantage in the morning and evening. It may not sound like much but you gain time at the most prime wildlife time.
 
Aug 1, 2017
226
129
F4, 2.8 and 2.0 aren't just about shutter speed and ISO. The fast telephoto's draw like portrait lenses. Even the 400 5.6L which probably isn't quite as tack sharp as some of the newer L glass renders very nicely IMO.
 

ethanz

1DX II
Apr 12, 2016
934
186
ethanzentz.com
Not necessarily. It depends on the lens.
With the 500mm F/4 the lens may be moving more mass inside.
Battery power, (other bodies vs the 1D line) seems to matter more for speed on the bigger lenses.

One stop is an 8 to 10 minute advantage in the morning and evening. It may not sound like much but you gain time at the most prime wildlife time.
I meant not in terms of the lens but the AF sensor in the body.