If Nikon has one advantage over many of the other vendors of digital SLRs (other than
making great, affordable cameras), it’s the mind-bending assortment of high-quality
lenses available to enhance the capabilities of cameras like the Nikon D7000. You can
use thousands of current and older lenses introduced by Nikon and third-party vendors
since 1959 (although lenses made before 1977 may need an inexpensive modification).
These can give you a wider view, bring distant subjects closer, let you focus closer, shoot
under lower light conditions, or provide a more detailed, sharper image for critical work.
Other than the sensor itself, the lens you choose for your dSLR is the most important
component in determining image quality and perspective of your images.
This chapter explains how to select the best lenses for the kinds of photography you
want to do.

Sensor Sensibilities

From time to time you’ve heard the term crop factor, and you’ve probably also heard the
term lens multiplier factor. Both are misleading and inaccurate terms used to describe
the same phenomenon: the fact that cameras like the D7000 (and most other afford-
able digital SLRs) provide a field of view that’s smaller and narrower than that produced
by certain other (usually much more expensive) cameras, when fitted with exactly the
same lens.
Figure 11.1 quite clearly shows the phenomenon at work. The outer rectangle, marked
1X, shows the field of view you might expect with a 28mm lens mounted on one of
Nikon’s “full-frame” (non-cropped) cameras, like the Nikon D700, D3s, or D3x. The
area marked 1.5X shows the field of view you’d get with that 28mm lens installed on a
11
Working with Lenses