In contrast to a regular mirror, a dielectric mirror provides greater selectivity for reflection wavelengths and reflectivity. By careful choice of the type and thickness of the dielectric layers, one can design an optical coating with specified reflectivity at different wavelengths of light. This makes them suitable for a wide range of applications such as lasers, head-up displays (HUDs), space technology, and many others. I purchased this nearly two years ago as an upgrade from the diagonal included with my Meade Infinity 102. All Rights Reserved. I also upgraded to the Celestron 8-24 Zoom eyepiece, and the Astro-tech 32mm Plossl. 19 Review(s) The barrel is threaded to accept standard 1.25" filters. It works great with my Astro-Tech Paradigms. This diagonal allows the wide 32mm to function properly, where the stock plastic prism diagonal kidney beaned badly. This Sky & Tel Hot Product gives you all the visual performance your scope is capable of delivering, at a price that's very affordable. You must have JavaScript enabled in your browser to utilize the functionality of this website. Another excellent product from Astro-Tech! Extremely faint deep space objects at your scope's performance limits become more visible, changing your viewing from "I guess I see it" to "it's really there!". I have collected accessories I can rely on, and this diagonal is one of them. It's good to have a diagonal that matches the quality of the eyepieces. The other drawback to this combo is the shorter focus throw needed with this diagonal. I have been using this diagonal for around 4 years and have found it to be well made, well fitted and durable. The interior of the body is anodized an antireflective matte black. At 69.00 it is a steal. I've been very happy with this diagonal. Generally, dielectric mirrors have a limited reflection bandwidth. The quality of the build and the performance are both excellent, and the price is as stunning as the views this piece offers! Far better, both in terms of brightness/clarity and more reliable mechanical hold on your expensive eyepieces. It's very well made and gives clear, bright views. Definitely recommended. Dielectric mirrors offer higher reflectivity over a broad spectral range of a few 100 nm. A dramatic difference in image, with better contrast and more detail. I use this with my AT60ED when I'm want to take a break from photo and just enjoy some visual astronomy. Also feels solid. Bought this diagonal to replace the cheap stock one on my short tube refractor. I use it with my 72 and it is terrific. Not to mention a relative bargain. A rigid machined metal backplate with stainless steel hardware holds the mirror in perfect optical alignment in the machined body. This essentially eliminates any possibility of the diagonal bumping into the drive base of a short fork arm catadioptric when the scope is pointed at the zenith. Dielectric mirrors are also used to produce ultra-high reflectivity mirrors: values of 99.999% or better over a narrow range of wavelengths can be produced usiā€¦ I purchased this to replace the cheap plastic diagonal that came with my Celestron Astromaster 70EQ. The combo with the zoom is about as heavy as the CG-2 equatorial mount and long scope can handle, Celestron needs to consider a longer mounting rail on their Astromaster long tube refractors. The mirror housing is precision-machined from solid aluminum, rather than simply flimsy Bakelite plastic or a sheet metal stamping, as you'll find with ordinary diagonals. At the price, these Astro Tech diagonals are one of the best bargains around in amateur astronomy. Dielectric mirror for $69 bucks? The 1.25" eyepiece holder uses a non-marring soft brass compression ring to clamp eyepieces in place, rather than a thumbscrew that can scratch an eyepiece barrel by tightening down on it directly. Astro Tech has produced a great product in this 1.25" star diagonal. This is the number one choice for mirror tv installations because it provides flawless picture quality through the mirror, while still maintaining a beautiful reflection when the television is off. You can tell a big difference between a straight through view and one through a diagonal. Astronomics is a family-owned business that has been supplying amateur astronomers, schools, businesses, and government agencies with the right optical equipment and the right advice since 1979. This is markedly higher reflectivity than the 88% of a conventional aluminum diagonal or the 96-97% of an easily-tarnished silver diagonal. Both the zoom and 32mm focus right at the minimum of the Astromaster's focuser.

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