An updated version of Takahashi's 28mm Erfle eyepiece.
Features the original 5-element / 3-group design with improved anti-reflection coatings to minimise flare and ghosting.
Provides a flat field across the full 60°apparent field of view, which is close to the maximum field the eye can accept. (You can see the entire field without tilting your neck to see in the corners).
When used with the Takahashi FC-60CB, the 28mm Erfle provides 12.6x magnification.
Parfocal (little or no need to refocus when changing eyepieces) with Takahashi's Abbe Orthoscopics.
Focal length: 28mm
Eye relief: 20mm
Apparent field of view: 60°
Barrel diameter: 31.8mm (1.25")