I bought two of these from Andrews in 2009 (@ $119 ea) for my binos.
They are great, super wide angle and light and easy on the eye.
After selling binos I only need one, so i offer the other for sale here.
I think it is a great eyepiece.
I offer this one for sale for $78 (including registered post within Australia).
Comes with original William Optics end caps.
Non WO packaging.
William Optics
Model SWAN 20
Super Wide Angle
Focal Length 20(mm)
Apparent Field of View 72(degrees)
Lens Structure (#Elements/#Groups) 5/4
Eye Relief 17(mm)
Barrel 1.25(inches)
Coating FMC
Parfocal Yes
Weight 100g
Internally baffled
All lenses' edges and internal spacers blackened
Fully multicoated
