Will the Celestron 2" XLT Diagonal improve views in my 8" SCT over the stock diagonal?
Yes, absolutely. An 8" SCT has excellent optics, and a lower-quality diagonal can limit its potential. The 1/10 wave mirror will preserve the fine detail the telescope can resolve, and the XLT coatings will provide a noticeably brighter image on deep-sky objects compared to the standard 1.25" diagonal included with the telescope.
How does the 1/10 wave mirror help when observing Jupiter or Saturn?
Planetary observation relies on seeing maximum sharpness and contrast. A mirror with 1/10 wave accuracy introduces virtually no distortion to the light path. This means fine details like Jupiter's cloud bands, the Great Red Spot, or the Cassini Division in Saturn's rings will appear sharper and more defined than with a standard 1/4 wave diagonal.
What is the advantage of this mirror diagonal over a prism diagonal?
For telescopes with a focal ratio of f/7 or slower, like an SCT, a high-quality mirror diagonal is generally superior. Mirror diagonals are more color-neutral and do not introduce the chromatic aberration that some prism diagonals can, especially at high magnifications. The XLT mirror coatings also provide excellent light transmission across the entire visual spectrum.
Does this Celestron diagonal thread directly onto all SCTs?
This diagonal is designed to thread onto the standard rear cell of most Schmidt-Cassegrain telescopes, including virtually all models made by Celestron and Meade. It provides a much more secure connection than a slip-in diagonal that relies on a visual back and thumbscrews.
Can I use 2" filters with the Celestron XLT Diagonal?
Yes. The barrel of the diagonal is threaded to accept standard 2" astronomy filters. You can thread a filter directly onto the diagonal and then insert any 2" eyepiece, or you can thread filters onto the individual eyepieces themselves.
Why is the included aluminum case for the XLT diagonal important?
A diagonal's mirror is a sensitive optical surface. The foam-lined aluminum case protects it from dust, moisture, and impacts during transport and storage. Keeping the mirror clean and the housing perfectly aligned is critical to maintaining its 1/10 wave performance, and the case ensures it stays in pristine condition.
