21 millimeters

professional quality HD Compatible  more

Free Shipping! Tele Vue Plossl 8mm Eyepiece (1.25") Plossl 8mm Eyepiece (1.25"), 50° Apparent Field of View, 6mm Eye Relief  more

Free Shipping! Tele Vue Plossl 25mm Eyepiece (1.25") Plossl 25mm Eyepiece (1.25"), 50° Apparent Field of View, 17mm Eye Relief  more

The compact Tele Vue-60 Apochromatic Doublet Refractor Telescope elegantly combines high-performance optics with convenient portability.Measuring just 10" long ...  more

The Alpen PRO 10x50 wide angle binocular features multi-coated BAK4 optics providing a super bright viewing experience at an affordable price. The long eye relief ...  more

Coronado Solarscopes Personal Solar Telescope PST 40mm Model: 05PST. Coronado Personal Solar Telescope PST 40mm  more

This product is Tele Vueï¿œs 0.8x Reducer/Flattener (TRF-2008) for 400 to 600mm focal length refractor telescopes. While optimized for the Tele ...  more

Coronado PST - Personal Solar Telescope with 0.5A Bandwidth The PST is the latest innovation from Coronado. This "little" telescope is another step toward ...  more

The 41mm Panoptic eyepiece is a big brother to the 24mm Panoptic (largest 1.25" field). With its 46mm field stop, the 41mm Panoptic delivers the largest ...  more

Free Shipping! Tele Vue Plossl 40mm Eyepiece (1.25") Plossl 40mm Eyepiece (1.25"), 43° Apparent Field of View, 28mm Eye Relief  more

Free Shipping! Tele Vue Plossl 32mm Eyepiece (1.25") Plossl 32mm Eyepiece (1.25"), 50° Apparent Field of View, 22mm Eye Relief  more

Tele Vue Radian 6mm Wide Angle Eyepiece (1.25") Radian 6mm Wide Angle Eyepiece (1.25"), 60° Apparent Field of View, 20mm Eye Relief ...  more

[Pre Order - allow extra time] Tele Vue Radian 5mm Wide Angle Eyepiece (1.25") Radian 5mm Wide Angle Eyepiece (1.25"), 60° Apparent Field of View, ...  more

Free Shipping! Tele Vue Radian 3mm Wide Angle Eyepiece (1.25") Radian 3mm Wide Angle Eyepiece (1.25"), 60° Apparent Field of View, 20mm Eye Relief  more

[Pre Order - allow extra time] Tele Vue Radian 14mm Wide Angle Eyepiece (1.25") Radian 14mm Wide Angle Eyepiece (1.25"), 60° Apparent Field of View, ...  more

Tele Vue eyepieces come in several variations and focal lengths to match your particular preferences amongst the variables of size weight price eye relief and ...  more

Free Shipping! Tele Vue Nagler Type 6 9mm Wide Angle Eyepiece (1.25") Nagler Type 6 9mm Wide Angle Eyepiece (1.25"), 82° Apparent Field of View, 12mm ...  more

Free Shipping! Tele Vue Nagler Type 6 7mm Wide Angle Eyepiece (1.25") Nagler Type 6 7mm Wide Angle Eyepiece (1.25"), 82° Apparent Field of View, 12mm ...  more