Lamp
Photography lamps are useful for portraits or product photography. They have a filter or an umbrella to soften the light so the light is not too harsh on your subject. They are portable and can be positioned in different areas around your subject.
Backup Battery
Your camera will come with one battery, but if you work in the field or travel with your camera, you will want a spare battery. Batteries take a few hours to recharge, so you do not want to have a dead battery in the middle a photo shoot. You will also want to purchase a few extra memory cards. Since DSLR cameras can take such large photos, memory cards can fill up fast. Some photographers like to keep many cards on hand so they can use one per subject until they are uploaded to a computer.
Camera Bag
A camera bag is essential if you are going to travel. Look for one that has adjustable compartments to separate lenses, flash, and your camera. These compartments should be padded to keep your equipment safe. A backpack style bag is convenient for walking with your camera. Some bags will even hold your laptop, mp3 player, and have extra compartments.
Filter
To protect your expensive lens, you will want to purchase an inexpensive UV filter. This is a small, flat disc that screws on the end of the lens. It filters UV light and reduces glare to protect your camera and your eyes. It also protects your expensive lens against scratches and dust. Other filters are also available and can alter the look of your photos. You can get different colors or special effect filters for most lenses. Some filters can act as a faux macro or fish eye effect.
Computer
A computer is also needed for digital photography. Once you upload your photos, you can use a graphic program for post processing your photos. You can adjust the exposure, colors, and even add special effects. You will need a computer with plenty of hard drive space or an external hard drive. You will also need a good graphics program for the best post processing results.