Nikon D40X Посібник - Сторінка 8
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Part I
Using the Nikon D40/D40x
In fact, I'm going to have to show you a
mocked-up composite lens, shown in figure
1.10, to squeeze the extra features into a
single example.
By comparing the three lenses shown in fig-
ures 1.9 and 1.10, you can see that the con-
trols may be in different locations with
different lenses and can differ in size and
operation. The key components shown in
figure 1.9 are
Lens hood bayonet mount. You
use this lens hood bayonet mount,
shown on the 18–200mm zoom
for lens-specific hoods, with lenses
that don't use hoods that screw
into the filter ring.
Filter thread. Most lenses have a
thread on the front that you can
use to attach filters and other
accessories.
Focus ring. Rotate this ring to
manually focus or fine-tune focus
when you set the lens or camera
body focus mode switch to M. In
addition, if the lens has an auto-
focus/manual override position
(M/A-M), you can adjust focus
manually after the camera has
focused automatically.
Automatic/Manual focus switch.
Changing from automatic to man-
ual focus with the D40 or D40x is
done either with an Auto/Manual
focus switch on the lens, or by
using a menu choice on the cam-
era. There is no automatic/manual
switch on the camera body itself.
Some lenses have just a simple M-
A (Manual/Automatic) switch (like
the 18-55mm), while others have
an M/A-M switch that indicates the
lens can be focused automatically
with manual adjustment (M/A) or
manually (M) as indicated in 1.9.
You may notice that the 18-
Note
55mm kit lens has a much nar-
rower focus ring than the
18-200mm lens, that the entire
front element of the lens rotates
during focus, and that the lens
itself increases in length as you
focus closer. More expensive
lenses have non-rotating front
elements and internal focus so
the lens doesn't change in length
as it focuses on nearer subjects.
Distance scale. This scale (shown
on the 18-200mm lens, but not
the 18-55 kit lens) moves in uni-
son with the lens's focus mecha-
nism and shows approximately the
distance at which the lens has
been focused. It's a useful indicator
for double-checking autofocus, and
for roughly setting manual focus.
Zoom ring and focal length
scale. You rotate the zoom ring to
change the zoom setting. The focal
length scale markings show the
focal length.
Mounting index. Match this white
dot with the dot on the camera
body (located at roughly 2 o'clock
when you're looking at the front of
the camera) to properly mount the
lens.
Vibration Reduction switches.
Vibration Reduction (VR) lenses
have switches that you can use to
turn the vibration reduction feature
on or off, or to toggle between
Normal and Active mode (which
makes it possible to use VR even
when panning the camera).