Why do we need grommets?

What is the point of an eye with a camera? When I bought my Nikon D5000 won two eye. One that was already attached to the camera, a rubber band. And the other was plastic. What little eye in this picture: What is the point http://hothardware.com/articleimages/Item1411/Nikon-D5000-box-4534.jpg different eyepieces?

What appears in the image-content of the standard D5000-Kit is a cup of sight, but the eyes of a plug. The roof of the eye is a plastic cover black with no windows, replacing the eyepiece rubber body. The objective view of the PAC to prevent entry of light mirror box for the viewer window. The diffuse light has the ability counting and the effect it can possibly affect the contrast of the photos if strong enough. This is particularly important when shooting off-camera (ie remote, home, self-timer, interval timer, rotate, etc.). Alternatively, it may be useful in protecting the display window of storage. Eyepieces Aftermarket there and come in different shapes and sizes. It's all about comfort and utility. Some are better at filling in the viewer's eye than others. Also Cup is eye diopter lenses, or alternatively, although it can fit into their own categories.

D90 Unboxing

Nikon EH-6 AC Adapter $106.12 EH-6 AC Adapter Power Supply for the D2 Digital Series SLR Cameras…

Fotodiox Eye Cup Eyecup for Canon EOS Digital Rebels xt, xti, xs, xsi, t1i, t2i, 300D, 350D, 400D, 450D, 500D. 550D, 1000D $5.95 Fotodiox Eye Cup Eyecup for Canon EOS Digital Rebels xt, xti, xs, xsi, t1i, t2i, 300D, 350D, 400D, 450D, 500D. 550D, 1000D…

Bushnell H2O 10×42 Porro Prism Waterproof/Fogproof Binocular $69.24 Bushnell H2O 10×42 mm Waterproof Roof Prism Binoculars. Spend enough time on the water, and your equipment will spend some time in it. Fortunately, the H2O Series Binoculars are O-ring sealed and nitrogen-purged to completely lock out moisture should you spill, take one overboard, or simply run into foul weather along the way. Rubber armoring with texture pads gives you a grip in slippery situatio…

Nikon EH-69P Replacement AC Power Supply Adapter for CoolPix P300, P500, S3100. S4100, S6100, S9100 Digital Cameras $14.91 Hi-Speed USB connectivity with USB charging via Charging AC Adapter EH-69P (Replacemen…

Celestron Outland X 8×25 Binocular, Black $41.99 Celestron Outland X 8X25 Waterproof…

Citiwell National Geographic NG430 Binoculars See what you can spot with these pocket-sized National Geographic NG430 4×30 Binoculars!This fabulous binocular features 30mm glass objective lenses, rubber eyecups and strap. The National Geographic NG430 4×30 Binoculars is a perfect starter set for young naturalists. The compact size is ideal for little hands and the built-in compass enables you to take directional bearings. With the National Ge…

DISSECTING MICROSCOPE 20x – 40x STEREO BINOCULAR $349.99 Great Features for Stereoscopic Imaging: This microscope is designed for high quality stereoscopic viewing of a wide range of specimens. This microscope is manufactured with a rotating 2x – 4x stereo objective made from premium ground optical glass. Used in conjunction with the 10x (20mm) stereo eyepieces, you can achieve magnifications of 20x and 40x right out of the box. We offer a range of opti…

Bushnell Spacemaster 15-45×50mm 45 Degree Collapsible Spotting Scope Silver Black Compact Tripod $177.99 …

Bushnell Sentry 18-36×50mm Spotting Scope Camo Compact Tripod Waterproof Rubber Armor $139.99 …

Bushnell Trophy Xlt 20-60×65mm Spotting Scope Black Waterproof Rubber Armor Construction $251.99 …

Barska 8×30 Waterproof Crossover Binoculars $85.11 BAK-4 prisms for crisp and clear images, Twist-up eyecups, Large center focus knob, Rugged shock-absorbing rubber armor, Non-slip and ergonomic design for a secure grip

Barska 10×42 WP Crossover Mossy Oak Blaze Binoculars $0 These binoculars from Barska have been engineered to perform best under harsh conditions. These optics feature a unique Mossy Oak Blaze camo that makes you invisible to prey while still matching hunting regulation safety orange.