Explore Scientific 68 Series Eyepieces
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Explore Scientific 68 Series Eyepieces

  (1 Review)
✓ 2 year warranty


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About this product

Model:  es_68_28mm
Part Number:  0218628

These modern eyepieces with Super-Wide 68° Apparent Field Of View are an excellent choice for telescopes f5 or higher. 

Low dispersion glasses with high refractive index and anti-reflection multilayer coatings on all air-to-glass surfaces provide maximum light transmission and high contrast. Blackened lens edges and internal baffling also enhance contrast and minimise ghosting from internal reflections. 

Sealed waterproof construction and an Argon gas-purged interior protect the eyepiece from rain or dew and and eliminates internal condensation to ensure the optics remain pristine. 

Removable and foldable soft silicone-rubber eyecup for comfort and convenience and a tapered nosepiece provides peace of mind (the eyepiece is less likely to fall out of the focuser). 


  • Super-Wide 68 degree Apparent Field Of View
  • Waterproof construction for protection against rain, dew and dust
  • Argon gas-purged eliminates internal condensation 
  • Enhanced Multi-layer optical coatings for maximum contrast
  • All surfaces multicoated for maximum light transmission
  • Blackened lend edges to reduce ghosting and increase contrast
  • Long eye-relief - good for eyeglass wearers
  • Parfocal - little or no refocusing required when changing to another eyepiece from the same family
  • Foldable silicone-rubber eyecups

Eyepiece Field of View Simulator


Product Code021861602186200218624021862802186340218640
Eye Relief11.9mm15.3mm18.4mm21.6mm26.4mm31mm
Field Stop Diameter18.2mm22.8mm27.2mm31.8mm38.6mm45.5mm
Barrel Size1.25 / 31.8mm1.25 / 31.8mm1.25 / 31.8mm2 / 50.8mm2 / 50.8mm2 / 50.8mm
Barrel Length23.5mm23.5mm23.5mm31mm31mm31mm
Lens Groups444444
Height (From end of barrel)39.5mm48.3mm55mm62.5mm73.5mm86.5mm

Customer reviews

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Friday, 27 April 2018  | 

Very very good eyepieces on my 200mm f6 newton.
I have the 28mm and the 16mm. They are both very sharp almost to the edge, expecially the 16mm.
Don't be scaried, if you don't use eyeglasses the eye relief of the 16mm is more than enough, actually much more comfortable than a plossl or an ortho.
They barlow very well and the 16-20mm are ones of the very few medium f.l. widefield eyepieces without an internal barlow.


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