The Astromania Mars Filter allows you to view our second closest celestial neighbor in exceptional detail.Dielectric coatings transmit violet/blue (<505nm) and orange/red (>615nm) wavelengths where detail is rich, while blocking overbearing yellow/green (515nm-615nm) wavelengths. Using the Mars Filter: To use the Mars Filter you will need to thread it into a 1.25" eyepiece that can accept threaded filters. Simply thread the filter into the eyepiece barrel until it is finger tight. Although not necessarily recommended for viewing Mars, you may also try ?stacking? multiple filters by threading another into the bottom of the first. After threading a filter into the eyepiece, place the eyepiece into your telescope?s focuser and bring it into focus. You should now be able to observe Martian landscape features in detail. Care and Storage: When not in use, your filter should be kept in its original foam-lined case. Given proper care and storage, the filter should last a lifetime. Any quality optical lens cleaning tissue and optical lens cleaning fluid specifically designed for multi-coated optics can be used to clean the glass surfaces of the filter. Never use regular glass cleaner or cleaning fluid designed for eyeglasses. Before cleaning with fluid and tissue, blow any loose particles off the surface with a blower bulb or compressed air. Then apply some cleaning fluid to a tissue, never directly on the optics. Wipe the lens gently in a circular motion then remove any excess fluid with a fresh lens tissue. Use caution: rubbing too hard may scratch the filter glass. Do not remove the filter glass from its housing for cleaning.