Founder Optics Alien Eyepiece - 5mm 1.25"
The Founder Optics Alien Planetary Eyepieces bring flat-field performance to solar system planetary viewing in the form of three high magnification focal lengths. Each employs a sophisticated 7 element lens design reminiscent of exotic, high priced eyepieces to provide a sharp focus all the way to the edge of their wide 55° apparent field of view. The barrel distortion and field curvature aberrations common in standard eyepiece designs are virtually gone.
The Founder Optics Alien Planetary telescope eyepieces let you push the power, whether you're canvassing the lunar terminator or studying the Jovian cloud belts. The 7 element optics are fully multi-coated for high light transmission, and each eyepiece has 20mm eye relief for the an amazing viewing comfort. The series is also parafocal, so there is no need to adjust your focus while switching eyepieces.
Other nice touches: blackened lens edges, pop-down rubber eyeguards, and barrels threaded for 1.25" filters.
Barrel diameter: 1.25".