The Astro-Tech 1.25” and 2” Titan Series of very wide field (70°) eyepieces are excellent values, typical of Astro-Tech’s “more performance for less money” philosophy. Each uses five lenses in either a three or four group optical design to provide good field edge performance to go with that very wide field of view. All Astro-Tech Titan eyepieces are parfocal, to minimize the need for refocusing when you change eyepieces.
The edges of all Astro-Tech Titan Series lens elements are blackened and the interiors of the barrels are finished in matte black with antireflection threading. The resulting low internal reflections give you high visual contrast, with a dark sky background that makes low surface brightness objects stand out more clearly. All lenses are fully multicoated with the latest broadband high transmission/antireflection coatings for excellent light transmission and low ghosting.
Each Astro-Tech Titan eyepiece has a twist-up rubber-rimmed eyecup for eyeglass use. Protective dust covers are provided for both ends of each eyepiece. Rubber grip rings on the barrels of all focal lengths 15mm and above provide a sure grip when wearing gloves or mittens in cold weather.
There is a safety groove machined into each Titan barrel. This engages the thumbscrew or compression ring of your star diagonal or focuser drawtube to keep the eyepiece from falling should the thumbscrew accidentally loosen during use.
Unlike similarly-priced eyepieces whose focal lengths are only silk-screened onto the barrel, and are prone to rub off during use, each Astro-Tech’s model and focal length are laser-etched into the eyepiece body. The aluminum body material revealed by the etching provides permanent visibility against the body’s black anodized exterior.
All in all, the Astro-Tech Titan Series eyepieces offer surprisingly good value and very wide field 70° performance for surprisingly low prices.