More Information Price $79.95 Field of view 70° Eye Relief 13mm Focal Length 26mm Number of optical elements 5 Barrel Size 2" Weight 9.6 oz. Warranty 2 years

For example, with an 8” f/10 catadioptric it will give you a wide 0.91° actual field (0.65 square degrees in area) at 76.9x. This compares with the 0.65° actual field (0.33 square degrees in area) that you get at the same power with the typical 26mm Plössl supplied with most such scopes. The 26mm Astro-Tech Titan is a clear upgrade from the so-so eyepieces provided with most new catadioptrics.

With Dobsonians and short focal length refractors, the 26mm Titan is a superb low power eyepiece. With a 1143mm focal length 10” f/4.5 Dobsonian, for example, it provides 44x, a bright 5.8mm exit pupil, and a wide 1.6° field of view that’s over three times as wide as the Moon. It takes an object nearly six and a half minutes to cross that field of view, giving multiple observers plenty of time to take a look before you have to manually re-aim the scope. The 26mm Titan is a great eyepiece for family observing and star parties with a Dobsonian.

With a small refractor like the 80mm f/6.8 Astro-Tech AT-80ED, the 26mm Titan provides a huge 3.3° field at 21.2x. That makes it ideal for very wide field views of galaxy clusters, the larger nebulas, open clusters, and more.

Its 13mm eye relief is quite reasonable for this focal length, although it can somewhat limit the field for eyeglass wearers. Since the Astro-Tech Titan field is substantially wider to begin with than most other eyepieces in this price range, most eyeglass wearers won’t find the minor vignetting to be a drawback. Those who don’t wear glasses will see a huge field at only a fraction the cost of a more exotic super wide angle eyepiece.