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■ Symptom: low contrast from flare. Lenses are furnished with lens hoods for a
good reason: to reduce flare from bright light sources at the periphery of the pic-
ture area, or completely outside it. Because telephoto lenses often create images that
are lower in contrast in the first place, you’ll want to be especially careful to use a
lens hood to prevent further effects on your image (or shade the front of the lens
with your hand).
■ Symptom: dark flash photos. Edge-to-edge flash coverage isn’t a problem with
telephoto lenses as it is with wide angles. The shooting distance is. A long lens might
make a subject that’s 50 feet away look as if it’s right next to you, but your camera’s
flash isn’t fooled. You’ll need extra power for distant flash shots, and probably more
power than your D7000’s built-in flash provides. The Nikon SB-900 Speedlight,
for example, can automatically zoom its coverage down to that of a 105mm medium
telephoto lens, providing a theoretical full-power shooting aperture of about f/11
at 30 feet and ISO 400. (Try that with the built-in flash!)
David Busch’s Nikon D7000 Guide to Digital SLR Photography372
Figure 11.13
Pincushion
distortion in
telephoto
lenses causes
lines to bow
inwards from
the edges.