Check the listing for details. Thousand Oaks Optical 4"x4" Solar Filter Sheet for Telescopes, Binoculars and. Condition: New. Listed at 21.59 USD. Thousand Oaks Optical 4"x4" Solar Filter Sheet for Telescopes, Binoculars and Features: Make a filter on your own for any telescope / binoculars / camera, and for a fraction of what factory made filters cost. The sun will appear in a natural orange color when viewed through your telescope using this filter. WARNING: ALWAYS MAKE SURE THE FILTER IS WELL ATTACHED TO THE TELESCOPE/BINOCULARS, USING STICKY TAPE, TO KEEP IT FROM FALLING WHILE OBSERVING! Silver - black polymer is the most common filtering material for observing sunspots and granulation, through telescopes and binoculars. These sheets are a quality product of Thousand Oaks Optical, Arizona, a manufacturer of safe solar filters for over 30 years. "Stronger than Mylar with the filtering properties protected within the substrate. Guaranteed five years." Description: A good astronomer wants to use his telescope at night AND day. For this you need a high quality solar filter. Sunspots, eclipses and transiting satellites, all can be seen clearly and safely when using a silver-black polymer filter. The sun will appear in a natural orange color through your telescope. Buying the sheet and making the filter on your own will also save you a lot of money. Thousand Oaks Optical have been producing high quality solar filters for the past 30 years and we are an authorized distributor of theirs. Worldwide shipping available. Payment Immediate payment is required upon selecting 'Buy It Now' or upon checking out through your eBay cart. We accept payment through either PayPal or major credit card. Shipping Standard shipping is always free of charge. Orders with standard shipping travel via the best courier based on size and weight. The estimated delivery window will also be displayed during checkout. International shipping is not available at this time. Returns We offer simple and easy returns on almost all items within 30 days of delivery. Contact us for a return authorization and address to ship your item to.