Bit depth indicates the number of colors your digital camera can reproduce. The higher the bit depth the better the image quality. A camera with a 24-bit color capacity can process up to 16 million colors. Memory is used to measure the number of pictures your digital camera can store, which usually ranges from 16 to 40 images depending on the resolution of your snapshots. However, most models come with additional memory in the form of floppy disks or memory cards, which provide unlimited temporary storage capacity because they can be erased and reused.
Optics refers to the type of lens used.
Less expensive models typically have fixed lenses. Higher quality models have zoom lenses increasing the number of shot options. You can save hundreds of dollars by choosing the optics most compatible with your production needs. The type of viewfinder is another important feature to consider. Digital cameras come with an optical or LCD viewfinder, or both.