Whiter and brighter images. Simply put, that is the benefit the Everbrite mirror coating. This exotic, dielectric, nonmetallic coating is 99% reflective across the full visual spectrum, resulting in the "whitest," most natural image available. The coating is painstakingly applied to Pyrex with a surface accuracy of a 1/10 wave flatness. The Everbrite is offered in both 1¼" and 2" models. The diagonal bodies of each are machined from solid blocks of aluminum. In this way we can insure permanent alignment. The one piece body construction also assures heavy accessories can't force the diagonal body to "unscrew" from the barrel as with other brands. Both the 1¼" and 2" models feature brass clamp rings, anti-reflection threads and 1¼" and 48mm filter threads respectively.
Reviewed by 2 customers
I was skeptical about a diagonal making a discernible difference, but Tele Vue delivered again. 99% reflectivity is actually a noticeable upgrade over the stock 90% cheapos. If you have a quality OTA or eyepieces, you're not using them to their full potential with a mirrored aluminum diagonal. The Everbrite is a bit expensive, but it sure delivered. I've yet to be disappointed in a Tele Vue product.
Not as well built as the rest of my Televue equipment (not as heavy). Great optics works better than the Celestron Diag I have. It also has more back foucuse than others.