Portraits and landscapes require more versatile lenses and you will need to step up a category to get a digital cameras that offers a range of focal lengths. If you plan on shooting sporting events or events where the action is a long distance away, you'll need a camera with the equivalent focal lengths of 150mm-300mm. You will need correspondingly higher shutter speeds to stop motion. Only the more expensive cameras will give you the capabilities you need both in terms of lens and faster shutter speed. Storage and Downloading The total number of images that a digital camera can store is determined by image resolution, image compression, and the specifications of the memory device.
Many digital cameras use standardized removable memory cards.
These cards typically come in configurations ranging from 2MB to 170MB, and will hold anywhere from 12 to 120 images or more depending on resolution and compression. Some digital cameras store images onboard the camera. Once the memory is filled images must be either deleted or downloaded to make room for more. Memory cards are obviously very convenient but keep in mind that there are different standards and cards are not always interchangeable between cameras. Keep in mind that some digital cameras only erase globally meaning you can't selectively erase individual images.