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Figure 1.10 shows a single focal length, or

prime lens; as I explained earlier, this partic-

ular photo is a composite of more than one

lens to show several features at the same

time. Figure 1.10 displays some features

that are not available on either of the two

lenses in ﬁgure 1.9, but which you might

ﬁnd on some other lenses. As you might

expect, this non-zooming lens doesn't have

a zoom ring or zoom scale. But it does

include the following:

Focus ring

Limit switch

Infrared focus adjustment

Depth-of-field indicator

1.10

This macro lens is an example of a

prime (non-zoom) lens.

Chapter 1

Auto/Manual focus switch

Aperture lock

Aperture ring

Exploring the Nikon D40/D40x

Limit switch. When you use

lenses that have an extensive focus

range, you can see that some have

a special switch that limits the

range the autofocus system uses,

locking out either distant subjects

(when you're shooting close-up

photos) or extreme macro focus

distances (when you're taking pho-

tos of non-macro subjects). The

limit switch can speed up focusing

considerably by reducing the

amount of seeking that the lens

does in looking for the correct

focus point.

Aperture ring. Nikon lenses with

a G sufﬁx in their name (such as

the 18-55mm f/3.5-5.6G ED II AF-S

DX Zoom-Nikkor kit lens and

18-200mm f/3.5-5.6 G ED-IF AF-S

VR DX Zoom-Nikkor) lack a manual

aperture ring; therefore, you can

only use them with cameras that

are able to set the f-stop electroni-

cally from the camera body (such

as all recent Nikon ﬁlm and digital

cameras). Lenses that retain the

aperture ring, such as the lens

shown in ﬁgure 1.10, have a D suf-

ﬁx in their names.

Depth-of-ﬁeld indicator. Some

lenses have markings that show

the approximate range of sharp-

ness on the distance scale. In this

case, that range is indicated only

for f/32.

Infrared focus adjustment.

Infrared illumination doesn't focus

at the same point as visible light.

You can use the dot that appears

on a few lenses to change the

focus point that the lens selects or

to visually focus on to the appro-

priate point for infrared light.