Nikon D90 User Manual

Focus Lock
Focus lock can be used to change the composition after focusing, making it possible
to focus on a subject that will not be in a focus point in the final composition. It can
also be used when
the autofocus system is unable to focus (pg. 55). Focus lock is
most effective when Single point, Dynamic area, or 3D-tracking (11 points) is
selected for Custom Setting a1 (AF-area mode; pg. 173).
1 Focus.
Position the subject in the selected focus point
and press the shutter-release button halfway to l1d
initiate focus. Check that the in-focus indicator
(e) appears in the viewfinder.
2 Lock focus.
AF-A and AF-C autofocus modes (pg. 54): With the
shutter-release
button pressed halfway (CD),
press the AE-l/AF-L button (@) to lock both focus
and exposure
(an AE-L icon will be displayed in
the viewfinder). Focus will remain locked while
the AE-l/AF-L button is pressed, even if you later
remove
your finger from the shutter-release
button.
AE-UAF·L button
AF-S autofocus mode (pg. 54): Focus will lock automatically when the in-focus
indicator appears, and remain locked until you remove your finger from
the
shutter-release button. Focus can also be locked by pressing the AE-l/AF-L
button (see above).
3 Recompose the photograph and shoot.
Focus will remain locked between shots if you
keep
the AE-l/AF-L button pressed (AF-A/AF-C) or l!)
the shutter-release button pressed halfway
(AF-S), allowing several photographs in
succession
to be taken at the same focus
setting.
57

Nikon D90 Specifications

General

Megapixel	12.3 MP
Camera type	SLR Camera Body
Sensor type	CMOS
Sensor format	DX
Image stabilizer	No
Total megapixels	12.9 MP
Image sensor size	- \
Image formats supported	JPG, RAW
Maximum image resolution	4288 x 2848 pixels
Image sensor size (W x H)	23.6 x 15.8 mm
Still image resolution(s)	4288 x 2848 3216 x 2136 2144 x 1424
Mounting type	Bayonet
Lens mount interface	Nikon F
Video recording	Yes
Video resolutions	320 x 216, 640 x 424, 1280 x 720 pixels
Motion JPEG frame rate	24 fps
Maximum video resolution	1280 x 720 pixels
Analog signal format system	NTSC
Display diagonal	3 \
Vari-angle LCD display	-
Display resolution (numeric)	920000 pixels
Magnification	0.94 x
Viewfinder type	Optical
Eye relief	19.5 mm
Scene modes	Close-up (macro), Night portrait, Portrait, Sports, Landscape (scenery)
Image editing	Trimming
Photo effects	Black&White, Neutral, Vivid
White balance	Auto, Cloudy, Flash, Fluorescent, Incandescent, Manual, Sunny
Playback modes	Zoom
Camera playback	Highlights, Movie, Single image, Slide show, Thumbnails
Self-timer delay	2, 5, 10, 20 s
Camera file system	DCF 2.0, DPOF, Exif 2.21
Product color	Black
Flash modes	High-speed synchronization
Flash sync-speed	1/200 s
Flash range (wide)	- m
Memory slots	1
Compatible memory cards	SD, SDHC
Light metering	Centre-weighted, Matrix, Spot
ISO sensitivity	100, 200, 3200, 6400
Light exposure modes	Aperture priority AE, Auto, Manual, Shutter priority AE
ISO sensitivity (max)	6400
ISO sensitivity (min)	100
Light exposure correction	±5EV (1/2; 1/3 EV step)
Auto Focus (AF) points	11
Auto focusing (AF) modes	Servo Auto Focus, Single Auto Focus
Camera shutter type	Electronic
Fastest camera shutter speed	1/4000 s
Slowest camera shutter speed	30 s
USB version	2.0
Power source type	Battery
Battery type	EN-EL3e
Battery life (CIPA standard)	850 shots

Weight and Dimensions

Depth	77 mm
Width	132 mm
Height	103 mm
Weight	620 g