Features:
• Image Quality. Made possible by the 10.2 effective megapixel and exclusive Nikon image-processing engine which assure stunning sharpness and vivid color. The CCD sensor delivers images that are great for making enlargements of 24x36 inches and beyond. The high resolution also provides room for creative cropping.
• Smallest SLR Ever. The beautifully styled D40 is more convenient, easier to use and all packed in a camera that weighs just over 16 ounces.
• Fast Startup. Instant Shutter. A 0.18 sec. startup. split-second shutter response and rapid-action shooting make it easy to freeze special moments instantly.
• Up to 3 Frames per Second. Captures high-quality action sequences of children in sporting activities such as soccer, baseball and anything else.
• 2.5-Inch Monitor. Features 230,000-dot color and 170 degree wide angle viewing playback images. Easy to use and enables image preview at up to 19 times magnification.
• 3 New Display Options. Display in Classic, Graphic or Wallpaper, each of which has carefully designed color schemes help make changing camera settings easier than ever.
• Built-in Speedlight. Includes i-TTL automatic flash control with the precision needed to achieve better automatic flash balance and deliver outstanding images. Great in darkened conditions, as well as adding sparkle for fill flash in outdoor situations for enhanced twilight shots.
• 8 Shooting Modes. Automatic modes include: Auto Flash-OFF, Portrait, Landscape, Child, Sports, Close Up and Night Portrait; each of which adjusts automatically for optimal results for everyday shooting situations. Each mode considers lighting conditions and possibilities, aperture, shutter speed, white balance, hue, tone, sharpening and more to make creative photography as simple as rotating the mode dial.
• In-Camera Editing. Retouch Menu features include Nikon D-Lighting, red-eye correction, image trim, image overlay, monochrome (black and white, sepia and cyanotype) along with skylight, warm tone and color balance filter effects. The in-camera editing provides greater creative freedom without the need for a computer.
• Advanced Help Menu. Features Assist Images which help you select the appropriate settings for many camera features by showing an example image typical of that setting. Just press the HELP button beside the LCD monitor to see a context-sensitive Help page.
• Color Matrix Metering. 3D Color Matrix Metering II evaluates each scene for brightness, color, contrast, size and position of shadows and highlights, selected focus area and camera-to-subject distance, comparing that information against an onboard database of more than 30,000 actual photographic scenes. Instantly delivers precise exposures for each scene, even in challenging lighting conditions.
• 3-Area Autofocus. Inherited from more advanced Nikon digital SLR cameras, the system has refined algorithms to deliver fast, efficient autofocus.
• Image Optimization. Settings that let the photographer adjust color, contrast and sharpening as well as other image settings, according to the type of scene or output desired. Settings include: normal, softer, vivid, more vivid, portrait, custom and black and white and each are automatically adjusted.
• Long-lasting Battery Charge. The EN-EL9 rechargeable battery included will allow for shooting up to 520 images per charge.

Specifications:
Type of Camera: Single-lens reflex digital camera
Effective Pixels: 10.2 million
Image Sensor: RGB CCD, 23.6 x 15.8 mm; total pixels: 10.75 million, Nikon DX format
Image Size (pixels): 3,872 x 2,592 [L], 2,896 x 1,944 [M], 1,936 x 1,296 [S]
ISO Sensitivity: 100 to 1600 in steps of 1 EV with additional setting one step over 1600
Storage Media: SD memory card, SDHC compliant
Storage System: Compressed NEF (RAW): 12-bit compression; JPEG: JPEG baseline compliant
File System: Exif 2.21, Compliant DCF 2.0 and DPOF
White Balance: Auto (TTL white balance with 420-pixel RGB sensor); six manual modes with fine tuning and preset white balance
LCD Monitor: 2.5-inch, 230,000-dot, low-temperature polysilicon TFT LCD with 170-degree wide-angle viewing and brightness adjustment
Playback Function: 1 frame; thumbnail (4 or 9 segments); magnifying playback; slide show; histogram indication; highlight point display; auto image rotation
Delete Function: Card format, all frames delete, selected frames delete
Video Output: NTSC or PAL
Text Input: Up to 36 characters of alphanumeric text input available with LCD monitor and multi selector; stored in Exif header
Compatible Lenses*:  Nikon F mount with AF coupling and AF contacts Type G or D AF Nikkor: 1) AF-S, AF-I: All functions supported; 2) Other Type G or D AF Nikkor: All functions supported except autofocus; 3) PC Micro-Nikkor 85mm f/2.8D: Can only be used in mode M; all other functions supported except autofocus; 4) Other AF Nikkor AI-P Nikkor: All functions supported except autofocus and 3D Color Matrix Metering II; 5) Non-CPU: Can be used in mode M, but exposure meter does not function; electronic range finder can be used if maximum aperture is f/5.6 or faster; 6) IX Nikkor lenses cannot be used
Picture Angle: Equivalent in 35mm [135] format is approx. 1.5 times lens focal length
Eyepoint: 18mm (-1.0 m-1)
Viewfinder: Fixed-eye level penta-Dach mirror type; built-in diopter adjustment (-1.7 to +0.5m-1)
Focusing Screen: Type B BriteView Clear Matte screen Mark V with superimposed focus brackets
Viewfinder Frame Coverage: Approximately 95% (vertical/horizontal)
Viewfinder Magnification: Approx. 0.8x with 50mm lens at infinity; -1.0 m-1
Viewfinder Information: Focus indications, AE/FV lock indicator, shutter speed, aperture value, exposure/exposure compensation indicator, exposure mode, flash output level compensation, exposure compensation, number of remaining exposures, flash-ready indicator
Autofocus: TTL phase detection by Nikon Multi-CAM530 autofocus module with AF-assist (range approximately 0.5-3.0m/1ft. 8in.-9ft. 10in.); Detection range: -1 to +19 EV (ISO 100 at 20 degrees C/68 degrees F)
Lens Servo: 1) Autofocus (AF): Instant single-servo AF (AF-S); continuous servo AF (AF-C); auto AF-S/AF-C selection (AF-A); predictive focus tracking automatically activated according to subject status; 2) Manual focus (M)
Focus Area: Can be selected from 3 focus areas
AF Area Modes: 1) Single Area AF; 2) Dynamic Area AF; 3) Dynamic Area AF with Closest Subject Priority
Focus Lock: Focus can be locked by pressing shutter-release button halfway (single-servo AF) or by pressing AE-L/AF-L button
Exposure Metering System: TTL full-aperture exposure metering system: 1) 3D Color Matrix Metering II (type G and D lenses); Color Matrix Metering II (other CPU lenses); metering performed by 420-segment RGB sensor; 2) Center-weighted: Weight of 75% given to 8mm circle in center of frame; 3) Spot: Meters 3.5mm circle (about 2.5% of frame) centered on active focus area
Exposure Metering Range: 1) 0 to 20 EV (3D Color Matrix or center-weighted metering); 2) 2 to 20 EV (spot metering)
Exposure Modes: Digital Vari-program (Auto, Auto [Flash Off], Portrait, Landscape, Child, Sports, Close Up, Night Portrait), Programmed Auto (P) with flexible program; Shutter-Priority Auto (S); Aperture Priority Auto (A); Manual (M)
Exposure Compensation: plus or minus 5 EV in increments of 1/3 EV
Exposure Lock: Exposure locked at detected value with AE-L/AF-L button
Shooting Modes: 1) Single frame shooting mode; 2) Continuous shooting mode: approx. 2.5 frames per second*; 3) Self-timer mode; 4) Delayed remote mode: 2 s. delay; 5) Quick-response remote mode
*Approx. 1.7 frames per second with Noise Reduction turned on and approx. 1 frame per second with ISO HI1
Shutter: Combined mechanical and CCD electronic shutter, 30 to 1/4000 sec. in steps of 1/3, bulb
Sync Contact: X-contact only; flash synchronization at up to 1/200 sec.
Flash Control: 1) TTL: TTL flash control by 420-segment RGB sensor, i-TTL balanced fill-flash for digital SLR and standard i-TTL fill-flash for digital SLR available when CPU lens is used with built-in flash, SB-800, SB-600 and T041; 2) Auto aperture: Available with SB-800 with CPU lens; 3) Non-TTL Auto: Available with Speedlights such as SB-800, 80DX, 28DX, 28, 27 and 22s; 4) Range-priority manual available with SB-800
Flash Sync Modes: Auto, Portrait, Child and Close Up modes: 1) Auto, auto with red-eye reduction; fill-flash and red-eye reduction available with optional Speedlight; 2) Night portrait mode: Auto, auto slow sync, auto slow sync with red-eye reduction; slow sync and slow sync with red-eye reduction available with optional Speedlight; 3) Landscape, Sport mode: Fill-flash and red-eye reduction available with optional Speedlight; 4) P, A: Fill flash, rear-curtain with slow sync, slow sync, slow sync with red-eye reduction, red-eye reduction; 5) S, M: Fill flash, rear-curtain sync, red-eye reduction
Built-in Flash: Auto, Portrait, Child, Close Up, Night Portrait mode: Auto flash with auto pop-up P/S/A/M: Manual pop-up with button release Guide number (ISO 200/ISO 100, m [ft.]): approx.17 [55]/12 [39] (manual full 18 [59]/13 [42]
Flash Compensation: -3 to +1 EV in increments of 1/3 EV
Accessory Shoe: Standard ISO hot-shoe contact with sync, signal and ground contacts and safety lock
Self-Timer: Electronically controlled timer with duration of 2, 5, 10 or 20 seconds
Remote Control: Via optional ML-L3 Wireless Remote Control
Power Source: One Rechargeable Li-ion Battery EN-EL9; charging voltage (MH-23 quick charger): 7.4V DC, EH-5 AC Adapter (available separately; requires optional EP-5 AC Adapter Connector)
Tripod Socket: 1/4 in. (ISO1222)
Dimensions (W x D x H): Approximately 5.0 x 2.5 x 3.7 inches
Weight: Approximately 1 lb., 1 oz. without battery, memory card or body cap