Introduction
Welcome to the user manual for your Nikon D90 Digital Single-Lens Reflex (DSLR) camera. This manual provides essential information to help you get started, understand its functions, and maintain your camera for optimal performance. The Nikon D90 features a 12.3-megapixel DX-format CMOS sensor, D-Movie mode for cinematic HD video, and a 3-inch high-resolution LCD monitor.
Setup
1. Attaching the Lens
To attach a lens, align the mounting mark on the lens with the lens mount index on the camera body. Rotate the lens counter-clockwise until it clicks into place. Ensure the lens is securely fastened before use.

Image: Front view of the Nikon D90 camera body, showing the lens mount where an interchangeable lens would be attached.
2. Inserting the Battery
The Nikon D90 uses a Lithium-Ion EN-EL3e rechargeable battery. Open the battery chamber cover located at the bottom of the camera. Insert the battery with the contacts facing the correct direction, then close the cover until it locks. Ensure the battery is fully charged before first use.
3. Inserting a Memory Card
The camera supports SD/SDHC memory cards. Open the memory card slot cover on the side of the camera. Insert the memory card with the label facing the back of the camera until it clicks into place. Close the cover securely. The camera will prompt you to format the card upon first insertion or if it's new.

Image: Side view of the Nikon D90 camera, highlighting the memory card slot cover.
4. Initial Power On
After inserting the battery and memory card, turn the camera on using the power switch located around the shutter release button. Follow any on-screen prompts for initial setup, such as setting the date and time.
Operating the Camera
1. Basic Shooting Modes
The mode dial on the top of the camera allows you to select various shooting modes:
- AUTO: Fully automatic mode for point-and-shoot simplicity.
- P (Programmed Auto): Camera sets shutter speed and aperture for optimal exposure.
- S (Shutter-Priority Auto): You set shutter speed, camera sets aperture.
- A (Aperture-Priority Auto): You set aperture, camera sets shutter speed.
- M (Manual): You control both shutter speed and aperture.
- SCENE: Various scene modes for specific situations (e.g., Portrait, Landscape).

Image: Top view of the Nikon D90 camera, displaying the mode dial on the left and other control buttons.
2. Focusing
The D90 features an 11-point autofocus system. You can select different focus modes:
- AF-A (Automatic AF): Camera automatically selects single-servo or continuous-servo AF.
- AF-S (Single-Servo AF): For stationary subjects. Focus locks when shutter-release button is pressed halfway.
- AF-C (Continuous-Servo AF): For moving subjects. Camera continuously focuses while shutter-release button is pressed halfway.
Use the focus selector switch on the front of the camera to choose between autofocus (AF) and manual focus (M).
3. Recording Videos (D-Movie Mode)
To record video, set the mode dial to the D-Movie mode. Press the Live View button to activate Live View, then press the shutter-release button to start and stop recording. The D90 records 720p HD video at 24 frames per second in MP4 format.
4. Image Playback
Press the Playback button (usually marked with a triangle icon) to view your photos and videos on the 3-inch LCD monitor. Use the multi-selector (directional pad) to navigate through images. Zoom in or out using the zoom buttons.

Image: Rear view of the Nikon D90 camera, featuring the 3-inch LCD screen and various control buttons for menu navigation and playback.
5. Using the Built-in Flash
The D90 has a built-in flash. In automatic modes, the flash may pop up automatically in low-light conditions. In manual or semi-automatic modes, you can manually raise the flash by pressing the flash button. Flash modes include auto, fill-in, red-eye reduction, and slow synchronization.
Maintenance
1. Cleaning the Camera
- Camera Body: Use a soft, dry cloth to wipe the camera body. For stubborn dirt, slightly dampen the cloth with water. Avoid harsh chemicals.
- Lens: Use a lens brush to remove dust, then a lens cleaning solution and a microfiber cloth. Never touch the lens surface with your fingers.
- Sensor: Sensor cleaning should be performed by a professional or with extreme care using specialized tools to avoid damage.
2. Battery Care
- Always use the provided charger for your EN-EL3e battery.
- Store batteries in a cool, dry place when not in use.
- Avoid fully discharging the battery frequently to prolong its lifespan.
3. Storage
When not in use, store your Nikon D90 in a dry, dust-free environment, preferably in a camera bag. Remove the battery if storing for extended periods. Avoid extreme temperatures and high humidity.
Troubleshooting
- Camera does not turn on: Ensure the battery is fully charged and correctly inserted. Check if the power switch is in the 'ON' position.
- Memory card error: Reformat the memory card (this will erase all data). If the error persists, try a different SD/SDHC card. Ensure the card is not write-protected.
- Blurry photos: Check your focus mode (AF-S for stationary, AF-C for moving subjects). Ensure sufficient light or use the flash. Check shutter speed; a faster shutter speed reduces blur from camera shake or subject movement.
- Flash not firing: Ensure the flash is raised. Check flash settings in the camera menu. In some scene modes, the flash may be disabled.
- Video recording stops unexpectedly: Ensure your memory card has sufficient free space and is fast enough for video recording.
For more complex issues, refer to the comprehensive manual available on the Nikon support website or contact Nikon customer service.
Specifications
| Feature | Specification |
|---|---|
| Sensor | 12.3-megapixel DX-format CMOS |
| Image Resolution | 12.3 MP (Effective) |
| ISO Sensitivity | 100-51200 (Expanded) |
| Shutter Speed | 1/4000 to 30 seconds |
| Video Resolution | 720p (1280x720) at 24 fps |
| Video Format | MP4 |
| LCD Monitor | 3-inch, 920,000-dot color LCD |
| Storage Media | SD/SDHC memory cards |
| Battery Type | Lithium-Ion EN-EL3e rechargeable battery |
| Battery Life (Approx.) | 850 shots |
| Autofocus Points | 11 |
| Connectivity | HDMI, USB |
| Weight | 1.6 Pounds (body only) |
Warranty and Support
Warranty Information
This Nikon D90 camera comes with a 90-day limited warranty. Please retain your proof of purchase for any warranty claims. The warranty covers manufacturing defects under normal use. For full terms and conditions, please refer to the warranty documentation provided with your product or visit the official Nikon website.
Customer Support
For further assistance, technical support, or service inquiries, please visit the official Nikon support website or contact their customer service department. You can find contact details and FAQs on their website.







