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This is a used Televue 13mm Plossl. They is an oldie, but a goodie; they don't even make these anymore! It is in used but very good condition, with clean optics. Comes with bottom cap only, as well as a winged eyecup, but no box.
Since TeleVue introduced their Plössls in 1980, they have won praise and patents, including a patent in Japan. Tele Vue Plössls, designed by Al Nagler, have been a recognized benchmark of performance and value in the class of 50° apparent field of view eyepieces. While the Plössls may be TeleVue's least expensive eyepiece line, they still enjoy the same care and attention to detail as their most expensive. While it's easy for other manufacturers to vie for the lowest price, Tele Vue continues to believe that quality, performance and consistency will ultimately reward you with the most value for your dollar.
Diffraction limited "on-axis" performance is a given. Using more expensive high-index glasses to reduce astigmatism and lateral color at the field's edge, Tele Vue Plössls deliver sharper images than any other brand of 4 or 5 element "Plössls" or Orthoscopic designs. The faster the focal ratio of your telescope, the greater your visual reward for using Tele Vue eyepieces. Tele Vue Plössls feature full multicoatings for greatest light transmission and contrast. Blackened lens edges and internal anti-reflection threads tweak the last bit of contrast for maximum image detail. The sharper field focuses faint star light into perceptible points and allows those with undriven mounts to gaze longer before repositioning the image.
For a bit more than generic brands, you can own genuine Tele Vue Plössls.
The 25mm, 20mm, 15mm, 11mm and 8mm Plössls round out the focal lengths for various observing from deep sky to planetary. They work best with Tele Vue Powermates to effectively double the number of focal lengths in your collection. Far superior to eyepieces usually provided as standard with most instruments.
This information is for the 11mm Plossl; the 13mm will be similar but different.
|Focal Length (mm)||11|
|Barrel Size (in.)||1¼"|
|Apparent Field of View (deg.)||50|
|Eye Relief (mm)||8|
|Weight (lb / oz)||0.14 / 2.2|
|Field Stop (mm)||9.1|