* Astronomy

1.25" TS Optics PARAGON ED Eyepiece series

The 6-element design with ED glass element with broadband multicoating on each glass-to-air surface and blackened lens edges provide sharpness throughout the field of view for a bright, high contrast view without disturbing internal reflection. 
The ED glass element minimises false colour fringing. ED stands for "Extra-Low Dispersion". These eyepieces use optical glass in which two of the lens elements are crafted from a special grade of glass that provides much superior refractive properties as compared to standard optical glass. This results in much better colour correction. 

The eyepiece housing is machined from aluminium and anodised. 
The chrome barrel features a setscrew recess for added security.

A rubber traction ring ensures a secure grip and a soft rubber eyeguard helps to block out stray light. All eyepieces are parfocal and are threaded to accept standard 1.25" (1¼") filters. 

Read more  

Ed ~ The eyepiece provides high resolution and excellent sharpness. The ED eyepiece is very comfortable to use with the large exit glass and 20mm eye relief. But, the short focal lengths (3.8, 5.2, 7.5mm) are where this eyepiece really excels (compared to standard plossl designs); the longer focal length eyepieces don't really offer that much better views than standard plossl designs to justify the (nearly double) price difference. The short focal lengths compares very favourably with orthoscopic eyepiece designs whilst giving a slightly wider field of view. A TMB Planetary II eyepiece has a wider field of view and provides equally sharp and bright views.