DSLRs allow photographers to store thousands of pictures on a memory card, while a roll of film in an SLR camera can only hold about 36 photographs. DSLRs also allow the photographer to preview the image after it has been taken, and make it easy to upload the photo to a computer to edit or print. can use SLR lenses on DSLR cameras, as long as they have the same mount type. protective lens: Water Resistant protective Lens cases for DSLR camera Lens size: 4 Size Thick camera Lens Bag for canon, Nikon, Sigma, pentax, sony, Olympus, Panasonic (pack of 4) quality: This Product is Made-in India with high-quality water-resistant nylon and polyester; durable metal zippers weight: A compact and lightweight camera backpack offers hands-free transport of your photography gear 1. Comfortable carrying?- well-padded back and harness Always protected?- well-padded camera insert and dividers