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Kokusai Kohki 1.25" Fujiyama HD-OR Orthoscopic Eyepiece (Japan) - 5mm

5.0 (3 Reviews) Read Reviews Write Review
Brand Kokusai Kohki
Part Number HD-OR 5mm
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 3 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      User Notes:
      Review by Michael S.
      1502047913
      Aug 6, 2017

      5.0 High quality ocular

      Pros:

      Cons:

      Comments:

      Thank you Agena and thank you Fujiyama for continuing to provide the astronomy community with high quality orthoscopic eyepieces. It's hard to add to all of the positive reviews these HD orthos have received over the years so I'll just say I hope we always have these as an option. Wide field designs come and go but there will always be a need for the simple ortho. Fujiyamas live up to the standard of the best of them.

      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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      User Notes:
      Review by John S.
      1500396592
      Jul 18, 2017

      5.0 Great eyepiece

      Pros:

      Cons:

      Comments:

      This is a high-quality eyepiece; craftsmanship is readily apparent. It performs well with my celestron 102 mm refractor. There seems to be less false color than with my plossls. Eye relief is comfortable. It works well for planets and double stars, when seeing permits.

      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 Ger of Canada.
      1401494400
      May 30, 2014

      5.0 Excellent orthos

      Pros:

      High quality

      Cons:

      None

      Comments:

      I have the 5mm & 7mm KK orthos and they are very good. They have a cool cast and compete directly with much more expensive eyepieces. Best views of Jupiter ever in my 10" dob. Great optics and great service at Agena.

      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) 1.50" (38.0mm)
      Max Width 1.34" (34.0mm)
      End Caps 2
      Eye Lens Diameter 0.18" (4.5mm)
      Eye Relief by Design 4mm
      Field Stop Diameter 3.4mm
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 5mm
      Lens Elements 4
      Lens Groups 2
      Parfocal Yes
      Rubber Eye Guard No
      Blackened Lens Edges Yes
      Manufacturer Kokusai Kohki
      Eyepiece Focal Length 5mm and Under
      Eyepiece Field of View Up to 50 degrees
      Eyepiece Series KK Fujiyama HD Ortho
      Barrel Type Smooth sided