The main function of this Rubber Eye Cup to shade the lens from stray light， improving your contrast and image quality. In inclement weather， it can assist in keeping moisture or wind-blown debris off the eyepiece. If you are not willing to pay the exorbitant prices for the original equipment， here is your chance!                                    Features             Installed in the eyepiece lateral， can prevent stray light incident， for comfortable， clear view <br> Convenience to carry for outdoor photographing<br> This is a must have add-on for your camera. This will fit any wide angle lense that accepts a threaded attachment <br> If you ever shoot outdoors， these are a must for reducing lense flares from entering your photos. In strong light such as sunlight， this Metal Hood will shadow the light， which will result in better contrast and overall picture quality<br>                                                            Specifications            Dimensions    4.7 x1.8 cm / 1.85" x 0.7" (Diameter x H)    <br>Weight    6 g / 0.21oz    <br>Material    Plastic， Rubber    <br>Color    Black    <br>Interface Dia    19mm    <br>Compatible With    Nikon D3X D3S D3 D700    <br>                                                            Package Includes            1 x DK-19 Rubber Eye Cup<br>