Used Explore Scientific 5.5mm 62 degree Argon-Purged Waterproof Eyepiece GoTo Only 2 elements of high

Only 2 elements of high index glass were required to reduce all aberrations to well below the airy disc in an f/4 system

94 Mirror Type (Monolithic/Conical/Fused conical) Mangin Corrector Coating HTMC™ Glass Type Borosilicate Primary Aperture (mm) 125 F/Ratio 2 Focal Length (mm) 250mm Image Circle 16mm Secondary Obstruction by Diameter 53mm Secondary Obstruction by Area 0

The filter box is foam lined for protection and shock absorption during handling

The premium four-element optical set is finished with multiple layers of high-transmission coatings for clear

Used Explore Scientific 5.5mm 62 degree Argon-Purged Waterproof Eyepiece GoTo Only 2 elements of highConditions: This is an Explore Scientific 5. 5mm 62 degree 1. 25" eyepiece in good condition. There is some light smearing of the optics on one side of the view that we have not been able to remove: see the photos. We have reduced the price accordingly as a result of this condition issue. Otherwise, the body is clean. Includes both dust caps, but no box. Save FIFTY BUCKS off of a brand new one! Description: Features Using advanced computer design,