A long-time favorite eyepiece with owners of big Dobsonians. It provides the same actual field of view as an 11 mm Plössl eyepiece, but with 57% higher magnification. Popular with Schmidt-Cassegrain owners as its 7 mm focal length provides the highest magnification(about 35x per inch of aperture) that's usable on an average night with an f/10 scope.
Apparent Field: 82 degrees
Field Stop Diameter (mm): 9.4
Eye Relief (mm): 10
Pupil size in mm with following f/ratio scopes
f/4.5 = 1.6; f/5.2 = 1.3; f/7 = 1.0; f/10 = 0.7; f/14 = 0.5
I am upgrading to all Type 6 Naglers so this one is for sale. This is the Nagler in the middle that look slightly smaller than the 5 and 9 mm.
Price: $135. Buyer to pay shipping.