Lunt Oculaire Flat-Field 60° 12mm - 1.25"

11 June 2026

Review of two eyepieces:

Lunt 60° 12mm Flat-Field Eyepiece - 1.25"

I frequently use Orion Linear Binoviewers with a 254mm reflector and refractors. I was looking for two eyepieces with fewer elements that would reduce internal reflections.

The clear aperture of the binoviewers is 17.4mm, which matches well with the 12.5mm field stop of these eyepieces. These are H-Alpha optimized, 656nm, and are excellent for solar viewing with a LS60MT telescope.

For night time viewing of bright objects such as the Moon they did not cause internal reflections. I found the colour separation good when scanning the night sky.

With the solar scope I got the following magnifications and view:

35x, TFOV = 1.7 degrees (102’),

and,

using a 254mm reflector, I got: 100x, FOV of 0.6 degree FOV (35’).

Julian Samuel