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| 'Fast Lenses ' |
The
lenses above are great telephoto zooms, but the slow variable maximum aperture
(f/4-5.6) means backgrounds won't be blown completely out of focus to isolate
your subject, while the slow maximum aperture will require you to use a higher ISO
in order to achieve a fast enough shutter speed.
If
you'll be shooting a lot of action, it's
worth looking at fast optics. Many pros favour a 70-200mm f/2.8 telephoto zoom:
it may not have quite the same reach as a 70-300mm, but the fast constant aperture
of f/2.8 is great for achieving shallow depth-of-field shots, and provides
plenty of flexibility for shooting at lower light levels, while the brighter
viewfinder provided by lens will aid autofocus speeds in trickly conditions.
Optically,
they're hard to fault and the build quality is first-class, but they don't
cheap - Canon's EF 70-200mm f/2.8L IS II and Nikon's 70-200mm f/2.8G AF-S ED VR
II, though Sigma's very good 70-200mm f/2.8 EX DG OS HSM is more affordable.
For Canon shooters, there's also the EF70-200mm f4 L, though it has no IS and
slightly slower maximum aperture.
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