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Resolution is the measurement of an image in pixels. Since the maximum available resolution of an image is increasing, digital cameras use a process known as "compression" to reduce the size of the image to a manageable size before it is stored. While this increases the amount of photos you can store on each memory card, there is a trade off in quality.
Printing people or portraits
Printing buildings and scenery
Digital Cameras store images in removable storage media such as compact flash card. The storage capacity depends on the memory space of the compact flash card.
A 32Mb Compact Flash card using a Canon camera
Dirt, dust and fingerprints impact the performance of your lens. And believe it or not, there is a right way and a wrong way to clean a lens. Do it right and you'll maintain peak optical performance. Do it wrong and you could scratch an expensive piece of photographic equipment.
For best performance, use only the manufacturer's Lens Cleaning Kit which contains cleaning solution, lens tissue and blower brush.
Carefully blow off any dust or dirt, using a blower brush or compressed air.
Place a drop of lens cleaning fluid on a clean piece of lens cleaning tissue, or blow gently on the lens so that moisture condenses on its surface.
Gently wipe the lens surface from the edges toward the center of the lens, with a lifting rather than rubbing action. A micro-fiber cleaning cloth is a good alternative to lens tissue, and requires no lens cleaning fluid.
Consider using a Skylight or UV filter as full-time protection of your lens, shooting your photos through it and removing it only when you're using another filter for special effect. And of course, don't forget to use your front and rear lens caps!
Your lenses are precision instruments just like your camera is. Protect them from shock, impacts and dust by using an appropriate lens case. And store them in cool, dry areas whenever possible.