![]() In the weeks leading up to the August 2017 U.S. solar eclipse, such sites hosted numerous sellers of eclipse glasses and other solar viewers that had not been properly tested and shown to be safe. ![]() We recommend that if you shop in an online marketplace (for example, to find eclipse glasses at the lowest price), you make sure that (1) the seller is identified on the site and (2) the seller is listed on this page. Thousand Oaks Optical (sheets and rolls available too).Solar Eclipse International/Cangnan County Qiwei Craft Co., Ltd.* (custom-printed viewers available).Rainbow Symphony (custom-printed viewers available).Lunt Solar Systems (available in kid sizes too).Flip'n Shades (available with visor or cap too).Explore Scientific (custom-printed viewers available).American Paperwear (custom-printed viewers available).American Paper Optics / / (custom-printed viewers available).Otherwise you can't be sure you're getting a product you can trust to protect your eyes. The upright sections are hinged so they fold down out of the way when not in use.Note 1: Baader Planetarium's AstroSolar Safety Film and AstroSolar Photo Film, sold in the U.S. I made the finder below from two pieces of flat PVC plastic and a piece of clear Plexiglas, which I frosted with fine sandpaper to make a screen. One nice variant is to open the body of the finder so you can look at the bright spot on the screen from above. After you’ve found the Sun in the scope for the first time with the finder attached, put a black dot in the center of the bright spot with a felt marker and you’ll have no trouble finding the Sun again. When aimed at the Sun, a bright spot of light shines on the white plastic. Cap the front end and drill a small ( 1 / 16-to- 1 / 8-inch) hole in the middle of the cap, then stretch a section of white plastic bag across the back. ![]() Designing it to fit on your regular finder’s mount is a good strategy, since you won’t be using that finder by day anyway.Ī 4- or 5-inch length of 1-inch-diameter PVC pipe makes a good finder body. You’re better off building a finder that you can mount solidly on your scope so it’ll remain aligned from use to use. Masking tape isn’t very elegant, and it’s hard to get the two tabs precisely aligned. Center it up, and you’re on target.Ĭut the front tab into an arrow shape with its point half as high as the rear tab and you get the same effect with a shadow instead of a bright spot. Poke a hole in the middle of the front tab, and move the scope around until the ray of light shining through the front tab hits the back tab. Put another tab a foot or two back, in line with the one on the front. Stick one on the front edge of your scope with an inch-long tab standing out. The simplest finder I’ve seen consists of two tabs of masking tape. You can either cast a shadow onto a target or cast a beam of light on a target. There are two basic ways, and both use the Sun as part of the system. Until you’ve tried it, you’d be amazed at how difficult it is to aim a telescope at the Sun without some kind of finder. ![]() With the filter on your scope, you won’t see any glow through the eyepiece until you’re right on it. (Seriously, don’t do that.) The Sun is too bright to even sight down the your telescope’s tube at safely. And it’s too bright to look at with your Telrad or optical finder. The detergent jug spout includes a convenient target frame.Ĭome on, how hard can it be? It’s right there, big and bright and half a degree acro.
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