Explore Scientific 99% Reflective Diagonal -2"

The primary advantage is light transmission. The Explore Scientific diagonal's dielectric coatings reflect 99% of light, compared to 88-95% for standard aluminum or silver diagonals. This results in a visibly brighter image, which is critical for observing faint deep-sky objects. These coatings are also far more durable and resistant to aging.

Yes, absolutely. On faint, extended objects like the Veil Nebula (NGC 6960) or the Horsehead Nebula (Barnard 33), maximizing light throughput is essential. The jump from a standard 90% diagonal to this 99% model provides a noticeable boost in contrast and brightness, especially when using nebula filters like an O-III or H-beta.

Instead of a single set screw that digs into the eyepiece barrel, a brass compression ring provides a firm, even grip around the entire circumference. This prevents the ugly scratches and gouges that set screws can cause, preserving the value and finish of your expensive 2-inch and 1.25-inch eyepieces.

Yes. The diagonal comes with a 1.25-inch adapter that fits securely into the 2-inch eyepiece holder. This adapter also uses a brass compression ring, so your 1.25-inch eyepieces receive the same non-marring protection.

While planets like Jupiter are bright, a 99% reflective diagonal still provides a significant benefit. By minimizing light scatter and maximizing transmission, it improves image contrast, making it easier to resolve fine details like small ovals in the cloud belts, subtle colors in the Great Red Spot, and the faint crepe ring of Saturn.

No. High-quality, multi-layer dielectric mirror coatings are designed to be color-neutral across the entire visual spectrum. Unlike some less expensive diagonals, the Explore Scientific 99% diagonal will not introduce any false color or tint to the image, ensuring the view remains as pure as your telescope's objective lens can deliver.