Founder Optics 5 mm LER Alien 1.25" Eyepiece - A-LER-5 Kite Optics Binoculars It also has an automatic

It also has an automatic DSLR shutter release control

This results in a focal length of 660 mm (663 mm)

loosen the three screws a half turn and then unscrew the lock

For solar work in conjunction with Baader AstroSolar Safety Film or Baader Herschel Wedge Prism (never use any eyepiece filter for solar observation without objective front filter)

Eye Relief (mm): 17

Founder Optics 5 mm LER Alien 1.25" Eyepiece - A-LER-5 Kite Optics Binoculars It also has an automaticAlien 5 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 5 mm. The 5mm 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