Orion Lanthanum 4mm Eyepiece - 1.25"



  • Focal Length: 4 mm
  • 8-Element Telescope Eyepiece 
  • LHD Eyepiece: High-Index, Low-Dispersion, Lanthanum Glass
  • Exceptional Control of Chromatic Aberrations
  • Provides True-Color with Outstanding Clarity
  • Ultra-Wide 80-Degree AFV
  • Eye Relief: Long 20 mm (Lets eyeglass wearers enjoy the view comfortably without removing glasses.)
  • Tapered 1.25-inch Barrel, Threaded for 1.25-inch Eyepiece Filters


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  • Regular price $279.99

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Orion Lanthanum 4mm Eyepiece - 1.25"

Orion's new ultra-wide angle Lanthanum eyepieces are sure to fill your visual astronomy needs, stellar optics and coatings combining to provide only the best for your enjoyment. The lanthanum glass utilized in this eyepiece helps to eliminate color-fringing and any kind of chromatic aberration, providing true-color views with high contrast and resolution. The luxurious 80-degrees field of view is something that has to be experienced to fully communicate, providing a truly immersive viewing experience in regards to the night sky as a whole.


With an ultra-wide 80-degrees field of view and true-color lanthanum optics, the powerful 4 mm Orion LHD eyepiece is sure to impress you with exquisite views of the night sky.


Like all Orion LHD eyepieces, this 4 mm model features an element of lanthanum glass which eliminates color-fringing and chromatic aberrations for true-color, high-contrast views of the cosmos with exceptional clarity. The luxuriously wide 80-degree AFV provides an almost panoramic viewing experience you must experience first-hand to fully appreciate. Views of everything from the Moon and planets to elusive deep-sky objects are impressively immersive in the fully multi-coated 4 mm LHD Ultra-Wide Eyepiece.


All Orion LHD 80-Degree Lanthanum Ultra-Wide Eyepieces are designed with viewing comfort in mind. All LHD eyepieces sport a large, 30 mm diameter eye lens to peer into for a relaxing experience. Each LHD eyepiece boasts a very long 20 mm eye relief so you can see the entire 80-degree field comfortably. If you wear eyeglasses while stargazing, you can leave them on while using an Orion LHD eyepiece and still enjoy the full field-of-view without eye strain.


The 4 mm Orion LHD 80-Degree Lanthanum Ultra-Wide Eyepiece features a tapered 1.25-inch barrel. The tapered barrel helps the eyepiece stay put in focusers and diagonals if a setscrew happens to become slightly loose during use. The 1.25-inch eyepiece barrel is threaded for use with compatible 1.25-inch Orion eyepiece filters.



  • Design: Ultra-Wide
  • Eyepiece focal length: 4.0 mm
  • Barrel size: 1.25-inch
  • Apparent field of view: 80.0-degrees
  • Eye relief: 20.0 mm
  • Coatings: Fully multi-coated
  • Number of elements: 8
  • Filter threads: Yes
  • Parfocal: Yes
  • Field stop diameter: 33.4 mm
  • Barrel security recess: Yes
  • Blackened lens edges: Yes
  • Rubber eyeguards: Yes
  • Body material: Aluminum
  • Case: Yes
  • Weight (oz): 20
  • Manufacturer's Warranty: One year


Manufacturer's Warranty Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only.