The inner diameter should match the full aperture of the objective lens, the outer diameter should be 10cm (~4″) larger. Using the compass, draw two circles on pieces of stiff cardboard.What you need for making your own solar filter: Baader AstroSolar ® Safety Film 5.0 or Baader AstroSolar ® Photo Film 3.8 (do not use Photo Film for visual observation!), two sheets of white stiff cardboard, pair of scissors, compass, some pieces of “Kleenex”-tissue, double-faced adhesive tape, paper glue Constructing a solar filter for binoculars.How to make your own objective solar filter for your camera, telescope, spotting scope or binocular.How To – build your own solar filter – Learn how to make your own solar filters using BAADER AstroSolar® Safety Film It´s that simple!. This foil is CE-tested and reduces the intensity of sunlight by 99.999% (optical density 5.0). It is made for the construction of high-quality objective-filters for observing the sun with telescopes, binoculars, camera or video-lenses. About AstroSolar® Solar Film – Learn more about the quality of our AstroSolar® Safety Film for solar observation.In this section you will learn how to protect your eyes and how to prevent accidents. Safety Instructions – Before you start exploring the sun it is very important to be informed about all the possible risks of solar observation.Baader Solar Filter Finder June 29, 2015.Transit of Mercury: May 9th, 2016 March 2, 2016.Solar Eclipse on the Molucca Islands March 16, 2016.Team Baader at the “Great American Eclipse” 2017 August 31, 2017.
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