The Sun is the only celestial object hazardous to the observer, it is important to note that without proper protection, even a glimps of the Sun through a telescope or binoculars can permanantly damage the eyes and the equipment.

While more economical aperture solar filters are made of Mylar plastic, glass filters leave the Sun with a more natural tint, as well as more durable.

These Orion Glass Solar Filters are a must have for observing the sun through a telescope, as they block out 99.9% of incoming sunlight.

The Orion filters are mounted in an aluminum cell that creates a snugly fit over the front of your telescope. They will fit diameters up to 0.25" smaller with foam tape liner supplied.

Which Solar Filter Fits My Scope?

Determining the Correct Orion Glass Solar Filter for your Telescope

A full-aperture solar filter is designed to fit over the front of a telescope. It allows safe viewing of the Sun by reducing the light by 99.99% and preventing concentrated heat from entering the telescope, which could cause injury to the user or damage to equipment.

If your telescope is not listed on our solar filter reference chart, you can determine the size of filter needed for your scope by taking the following steps:

Measure the maximum outside diameter (OD) of the front end of your telescope.

The solar filter sizes listed in our catalog and on our website refer to the inner diameter (ID) of the filter's foam-lined metal cell for Orion Glass Solar Filters, which slip over the front of the telescope. Choose a filter whose size matches the OD of your telescope's front end, or that is up to 0.25" larger than the front end (for Orion Glass Solar Filters only). For a filter that is up to 0.25" larger in diameter than your telescope, apply the supplied adhesive foam tabs as needed to the inside wall of the cell until the cell fits snugly over the front opening. (Note: The thumbscrews on Orion Glass Solar Filters are not intended as the sole means of securing the filter to your optical tube. A tight friction fit is required for safe usage)

Installing the Orion Glass Solar Filter on Your Telescope

With the three thumbscrews backed out to just inside the wall of the metal cell, place the solar filter over the outside of the telescope. It may require some light force to push the filter in place. Make sure it is seated completely over the telescope. Then lightly tighten the thumbscrews to further secure the filter on the telescope.