These 5 element wide angle 1.25" eyepieces represent excellent value
for money. They feature superior sharpness across the field and a
generous 66 degree field of view when compared with typical 4-element
Super Plossl designs. All air to glass surfaces have a multi-layer
coating for superior contrast and light transmission. Straight-up eyecup.
Insert tube has safety groove and is threaded for standard 1.25" filters.
Eye Relief 20mm (17mm Eye Relief), 15mm (13mm Eye Relief), 9mm (15mm Eye Relief),
6mm (14mm Eye Relief)