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Kokusai Kohki 1.25" Fujiyama HD-OR Orthoscopic Eyepiece (Japan) - 6mm

5.0 (4 Reviews) Read Reviews Write Review
Brand Kokusai Kohki
Part Number HD-OR 6mm
Availability available

Product Info

Manufacturer Description

Kokusai Kohki continues the tradition of offering the highest quality Japanese made Orthoscopic eyepieces with the introduction of their brand new FUJIYAMA HD-OR eyepiece lineup. Fujiyama HD-ORs are hand crafted at their Tokyo factory and individually inspected before shipping.

Named after the Japanese name for that sky reaching symbol of Japan - Mt. Fuji - the FUJIYAMA HD-ORs come standard with multicoatings on all air to glass surfaces (cemented lens surfaces are uncoated), giving them extended light throughput, and brighter images overall, as compared to Kokusai Kohki's previous volcano-top OR eyepiece lineup. And all lenses are edge blackened to reduce internal light scatter and reflections to an absolute minimum.

The entire Fujiyama lineup is parfocal, accepts standard 1.25" astronomy filters, and comes with plastic eyepiece caps. The chrome barrels of the Fujiyama HD-ORs are smooth-sided, and they have removed the helpful, but also often annoying, safety groove.

Solid construction, bright, clean and sharp views throughout a fully corrected 42 degree AFOV with sharp field stops makes the Fujiyamas perfect for every type of viewing. They are also an exellent match with high end apochromats for hard core planetary, lunar, solar and double star viewing.

Each eyepiece carries a one year Kokusai Kohki parts and labor warranty.

Reviews

5.0 (Based on 4 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      User Notes:
      Review by Paul W.
      1541817841
      Nov 9, 2018

      5.0 Fujiama HD orthos

      Pros:

      Cons:

      Comments:

      Going back to old-school certainly is refreshing when you have such quality Japanese lenses to look through. Sure they have narrower fields of view compared to the wide Field eyepieces of today. It’s the clarity and “snap” of the image that immediately strikes you. One look you’ll be hooked! Although these aren’t being made anymore... grab them while you can! You will not be disappointed!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    2. Guest

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      Review by James J.
      1539964756
      Oct 19, 2018

      5.0 Superb KK 6mm

      Pros:

      Cons:

      Comments:

      This is the 4th Fujiyama ortho eyepiece that I have accumulated from Agena over the past couple of years. As with the other focal lengths, it is a superb Abbe design that is great for double stars, planets and the moon. I found the sharpness, clarity, color rendition, contrast and edge of field to be on par with 6mm eyepieces I have from Brandon and a 1970s Clave Plossl. I sure hope they decide to issue more of these in the future. For the price they can't be beat. Even without considering price at all, they are of the highest quality and compare favorably with the best of their kind.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    3. Guest

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      Review by John of Tucson.
      1393891200
      Mar 3, 2014

      5.0 Excellent Eyepiece

      Pros:

      Lightweight,Quality Lenses,Easy to Use,Strong Construction

      Cons:

      Comments:

      Well constructed eyepiece and is as described by manufacturer. Observed Jupiter - superb with moons showing disks. Observed Trapezium and observed all companions (a - f). Observations made with FS 152 mm f/8 Takahashi.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    4. georgetatsis

      georgetatsis New Member

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      User Notes:
      Review by GeorgeT of New York.
      1390694400
      Jan 25, 2014

      5.0 Worth every penny of it!

      Pros:

      Strong Construction,Easy to Use,Quality Lenses,Lightweight,Accurate,Compact

      Cons:

      Comments:

      Three months ago I purchased the 4mm, 5mm, and 6mm Fujiyama orthos to compliment my 120ED refractor. The eyepieces are of excellent quality and highly recommended, so long as one doesn't mind the short eye relief. They are as good as other less glass eyepieces that cost twice as much.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Specifications

      Apparent Field of View 42°
      Barrel Size 1.25" (31.7mm)
      Bolt Case Included Yes - Free Agena Eyepiece Container
      Bolt Case Size Agena 37x60mm
      Coatings Multi-Coated
      Design Abbe Orthoscopic
      Height (without Eye Guard) 1.31" (33.4mm)
      Max Width 1.34" (34.0mm)
      End Caps 2
      Eye Lens Diameter 0.23" (5.8mm)
      Eye Relief by Design 4.9mm
      Field Stop Diameter 4.2mm
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 6mm
      Lens Elements 4
      Lens Groups 2
      Parfocal Yes
      Rubber Eye Guard No
      Blackened Lens Edges Yes
      Manufacturer Kokusai Kohki
      Eyepiece Focal Length 5.1mm - 10mm
      Eyepiece Field of View Up to 50 degrees
      Eyepiece Series KK Fujiyama HD Ortho
      Barrel Type Smooth sided