Founder Optics 3 mm LER Alien 1.25" Eyepiece - A-LER-3 Founder Optics From base of M54x0

From base of M54x0

Explore Scientific Finderscope Base w/ Screws Specifications

Coma is a common plague of the Newtonian reflector design

just as our space program was setting its sights on lunar exploration

Founder Optics 3 mm LER Alien 1.25" Eyepiece - A-LER-3 Founder Optics From base of M54x0Alien 3 mm Long Eye Relief Eyepiece Wow, Alien eyepieces are out of this world! With a very comfortable 20 mm of eye relief across the series, Alien eyepieces are a joy to view through; even high magnification focal lengths like this 3 mm. The 3 mm Alien eyepiece is parfocal with all other eyepieces in the Alien line, which means you will not need to re focus when you change eyepieces for a different magnification. The cool looking eyepiece body is