Helios Solar Glass® Off Axis Filter

This premium solar filter is safe to photograph or view the sun when mounted on your telescope. It is rated ND5 so 99.999% of the sunlight is blocked. The aperture is off center and made of high quality, reflective coated, Helios Solar Glass®, and mounted into an aluminum outer cell. It cannot be used a refractor type telescope.  The filter slips over the sky end of your optical tube. It is secured and centered to the optical tube with 3 nylon thumb screws. If you are not sure this is the right size filter for your optical device please click HERE, "How do I find the right size filter to order?"