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Erfle Eyepieces

Why are Burgess Optical Erfle Eyepieces better than standard Erfle Eyepieces?

We started with a classic 5 element Erfle design then added High Index glass (or in the case of the 39mm - Ultra High Index glass).  This allows for more efficient bending of light.  We addressed the common problem of inferior edge performance that is in the classic Erfle design by splitting one of the doublets.  With these modifications we were able to achieve 5 element eyepieces with sharp star images to the edge of the 67-70 degree FOV (field of view) and 90 degrees FOV for the 39mm eyepiece.  This eyepiece design uses no barlow elements, thus eliminating magnification change across the entire field which reduces curvature of field.  The only drawback to our Erfle design is it's short eye relief which makes producing high power versions of the eyepiece impractical.


16mm Erfle Eyepiece

Picture
Construction
  • Height - 65mm (56.5mm with eye cup down)
  • Width - 44mm @ Eyecup
  • Weight - 76 grams
  • Barrel Size - 1.25"
  • FOV - 67 - 70 Degrees
  • Eye Relief - 14mm
Features
  • 5 Element Modified Erfle Design
  • 18mm Field Stop
  • Fully Broadband Multi Coated
  • CNC Machined Barrel
  • Laser & Mechanical Engravings
  • Fully Baffled Low Barrel to Reduce Stray Light


24mm Erfle Eyepiece

Picture
Construction
  • ​Height - 80mm (73mm with eye cup down)
  • Width - 48mm @ Eyecup
  • Weight - 188 grams
  • Barrel Size - 1.25"
  • FOV - 67 - 70 Degrees
  • Eye Relief - 18mm
​
​$99
Features
  • 5 Element Modified Erfle Design
  • 26mm Field Stop
  • Fully Broadband Multi Coated
  • CNC Machined Barrel
  • Laser & Mechanical Engravings
  • Fully Baffled Low Barrel to Reduce Stray Light


35mm Erfle Eyepiece

Picture
Construction
  • Height - 120mm (109mm with eye cup down)
  • Width - 60mm @ Rubber Grip Ring
  • Weight - 460 grams
  • Barrel Size - 2.00""
  • FOV - 67 - 70 Degrees
  • Eye Relief - 18mm

  • Out of Stock
Features
  • 5 Element Modified Erfle Design
  • 39mm Field Stop
  • Fully Broadband Multi Coated
  • CNC Machined Barrel
  • Laser & Mechanical Engravings
  • Fully Baffled Low Barrel to Reduce Stray Light
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All Rights Reserved. Designated trademarks and brands are the property of their respective owners. 
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  • Home
  • Products
    • Ultra Red Dot Scope
    • Telescopes >
      • PlanetHunter Series
    • Binoculars >
      • UltraLight Series
      • Passport Series
      • Floating Binocular Strap
    • Eyepieces >
      • Ultra Monocentric >
        • Ultra Monocentric Eyepieces Blog
      • Erfle Eyepieces
      • Symmetrical Eyepieces
      • Planetary Eyepieces
    • Accessories >
      • Barlows
      • Filters >
        • Variable Dielectric Color Filters & Accessories
        • CX4 Contrast
        • OIII Filter
      • Diagonals >
        • CED
      • Binoviewer 1.9x OCA
      • MRF Bases
      • Cases
  • About Us
  • Contact Us
  • Astronomy Extras
    • Astro Images
    • STAR STUFF by Terry Alford
    • Product History Information >
      • Telescopes from Our Past
      • Binoculars from Our Past
  • Downloads & Info