It is safe to view the sun through this filter directly or mounted on a telescope, finder, spotting scope, etc. 99.999% of the sunlight is blocked. The aperture is made of a high quality, reflective coated glass and mounted into an aluminum outer cell. The filter is secured to the optical device with a nylon thumb screw. A natural yellow-orange image of the sun is viewed through the filter. It is packaged in a foam lined storage box, and included are instructions for use and care. The filter slips over the sky end of your optical tube. You must measure the outside diameter of your optical tube. To measure the diameter use a ruler, tape measurer, or caliper. You want to measure the widest distance across the end of your telescope. Measure from the outside of the casing on one side, across the center, to the outside of the casing on the other side. Order the solar filter size that is just larger than your measurement. You are comparing your measurement with the solar filter inside diameter (ID).
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