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.
Aug 6, 2017
High quality ocularPros: 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.
This review was provided courtesy of AgenaAstro.comJul 18, 2017
Great eyepiecePros: 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.
This review was provided courtesy of AgenaAstro.comMay 30, 2014
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.
This review was provided courtesy of AgenaAstro.comSort by
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