Diagonals

Buy	Item	Description	Price
		Stellarvue Enhanced 2 Inch Dielectric Diagonal #D1029ED This mirror star diagonal features a thick, oversized mirror. Polished to 1/10th wave minimum and coated with a protective, dielectric coating with 99% reflectivity. Compression ring and insert tube bevel will protect your valued eyepieces and help to better seat the diagonal in the focuser. . Includes a 1.25" adapter with compression ring. Both the two inch insert tube and adapter have filter threads. Rubber grip on the 2" tube for easy handling in cold climates. Unlike most others on the market, this diagonal is made factory adjustable and this allows us to make sure it is in exact alignment before it is shipped. We adjust and then star test every dielectric diagonal we sell. This is our best diagonal available to date. #D1029ED	$189
		Stellarvue Dielectric 1 1/4" Mirror Star Diagonal Comes with a thick, precision, optical flat mirror with an enhanced 99% reflective dielectric coating. Compression ring holds eyepieces firmly and the insert tube has the safety groove and filter thread. All aluminum construction. Individually tested for perfect alignment and star tested here for excellent performance. D1031ED	$99
		Dielectric 1 1/4" Mirror Star Diagonal. This is the same imported unit sold by many other vendors. We check these for reasonable alignment. 99% reflective dielectric coating. Compression ring. All aluminum construction. D1030ED	$69 $59
		1 1/4"45 Degree Erecting Prism High quality unit uses compression ring and has a tapered insert tube for better alignment. Provides images that are right side up and correctly oriented. Aperture is about 25mm. #D1032	~~$99~~ $69
		1 1/4"90 Degree Coated Erecting Prism 21mm aperture, correct image erecting prism for 1.25" eyepieces. #D1026	$39
		1 1/4"90 Degree Fully Multi-coated, Focusing Erecting Prism The correct image erecting prism is fully multicoated for superior contrast. It comes with a 1.25" helical focuser with set screw and features 15mm of focus travel by turning the rubber grip. Made for standard for 1.25" eyepieces. #D1026AF	$59
		Deluxe 2" 90 Degree Erecting Prism High quality unit uses compression ring and has a tapered insert tube for better alignment. Comes with compression ring 1.25" adapter. Tested for alignment. Provides images that are right side up and correctly oriented. 40mm clear aperture. While this unit is very convenient, dielectric mirror star diagonals are preferred for astronomical use. #D1033	$248
		1.4" Extension Tube Provides an additional 1.38" of outward focus travel. Uses a compression ring and has a safety groove on the insert tube. #ET1	$29
		Deluxe 2.4" Extension Tube Provides an additional 2.4" of outward focus. All aluminum anodized parts with rubber grip, brass compression ring, filter thread on insert tube and beveled insert which improves the snugness of the fit as the lock screw is tightened. This makes this unit popular with astrophotographers who need an extension to come to focus with certain cameras. Works well with our FA2 1 1/4" adapter. #ET3	$49

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	Star diagonals are essential in allowing users of astronomical telescopes to view comfortably so all Stellarvue telescopes are designed to be used with them. Unfortunately, many star diagonals have optical issues that can compromise an otherwise excellent telescope optic. Before designing our dielectric mirror diagonals we made an extensive study of after-market diagonals. Scroll down and check out this valuable information! We tested each one for alignment and optical accuracy on the Zygo Mark IV Interferometer. We discovered that while most mirrors were adequately flat, they were often deformed in their housings or misaligned. Realizing these major pitfalls, we took a full year to design the Stellarvue Dielectric Diagonals to ensure each one is free from these common and damaging issues.