50mm Masuyama (Ohi Factory Japan) Ultra Premium 85° FOV Eyepiece


Available on back-order

Masuyama – An Ultra Premium Eyepiece

This ultra-premium eyepieces is available via special order only.  Delivery is 7-10 days.

Designed from the ground up to bring out phenomenal performance in long refractors (e.g f/10+), these may well offer you the best views of your life.  Invariably described as “Brilliant EP’s”, and “Ultra Premium” for a reason.  Gorgeous Japanese build quality, no safety undercut, much lighter than comparable eyepieces, neutral colours, high contrast, velvet black, dark background sky, easy eye placement, no blackouts or kidney bean or distortion.


  • 50mm focal length
  • 53° degree visibility
  • Full Face Multicoating
  • 40mm Eye relief
  • 580gr
  • 2″
  • Comes with eyecaps, classic Masuyama black textured box
  • Smooth Chrome Barrels (no “safety” groove)
  • All Masuyama eyepieces have the focal plane at exactly the transition between the lower and upper barrels.

User Comments

“Brilliant EP’s – easily much better than Televue”

“To have the entire 85-degrees of AFOV sharp to the edge, the Masuyamas need a slower f-ratio scope, and f/10 is a good rule.  Nonetheless, there is plenty of crisp unaberrated central field to enjoy in even considerably faster scopes”

“I was just too taken with the enjoyment of observing these clusters in the 6” Apo through the Masuyama to bother with anything else” Bill P

“The Masuyama 32mm is killer in an Edge HD SCT”

“For the globulars and nebula observed the Masuyama 85° quickly became my favorite during the testing, showing them brightly, richer in details than the other eyepieces”

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Weight1 kg
Dimensions18 × 18 × 10 cm

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