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.
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 Barlows or Powermates to effectively double the number of focal lengths in your collection.
Far superior to eyepieces usually provided as standard with most instruments.
Review
This is a very good medium power eyepiece for lunar observing, resolving globular clusters, picking up detail in the more compact emission and reflection nebulas, etc.
This 15mm focal length is a very good in between power eyepiece, filling the gap between the 25mm eyepiece that comes standard with most scopes and a high power eyepiece.
It has 10mm eye relief . Like all TeleVue Plossls it has filter threads to fit your filters and blackened lens edges as well as being parfocal.