Orion 12.5mm Illuminated Reticle Plossl Eyepiece - 1.25"

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Orion 12.5mm Illuminated Reticle Plossl Eyepiece - 1.25"

The 12.5mm Orion Illuminated Plossl Telescope Eyepiece is great for accurate polar alignment. The 4-element Plossl design is also well suited for off-axis guiders, where light gathering is minimal. Fully multi-coated lenses, 4-deg apparent field. LED-illuminated double crossline reticle has adjustable focus and brightness. SR-44 batteries included. 1.25" diameter.

Orion 12.5mm Illuminated 1.25" Plossl Eyepiece Features

  • Four-element 12.5mm focal length 1.25" Plossl telescope eyepiece with an illuminated double crossline reticle
  • Excellent for accurate polar alignment, GoTo system alignment, IntelliScope system alignment, and acquiring and centering of guide stars for guided astrophotography pursuits
  • Fully multi-coated lenses provide bright views with a 4-degree apparent field of view
  • LED-illuminated double crossline reticle has adjustable focus and brightness
  • Illuminator requires SR-44 batteries (included)


Dust Caps IncludedYes
ER9mm or Less
Eye Guard IncludedYes
Eye Relief5mm
Eyepiece OpticsPlossl
Eyepiece Special FeatureIlluminated
Field of View40 degrees
Field Stop10.4mm
Focal Length12.5mm
FoV 59 Degrees
Lens Elements & Groups4 elements
ModelOrion Illuminated
Warranty1 Year Warranty
Customer Reviews
4.0 Based on 1 Reviews
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Great for Centering but...

The double cross reticle pattern is very useful for centering your scope during Star Alignment actions. But this eyepiece has a few issues, too... 1 The 40deg FOV is quite narrow, combined with the magnification of 12.5mm. This can be a challenge when moving from the wide field of a finderscope. 2 There is no eyecup, and the eyelens is nearly flush to the exterior. This means glare from any external sources must be shaded away with your hand - while also trying to use your hand-controller to center your scope. 3 Focusing the reticle is done by helical means of the eyelens element. As you twist this outward, it quickly begins to get rather loose and wiggly in its threads - and there is no stop before it comes lose in your hand. All that aside, once you have your target within the FOV, the illuminated thin-lined double-cross reticle makes it quite clear where to center your scope.