Fujiyama HD-OR eyepieces from Kokusai Koki

Kokusai Kohki has introduced a new series of Orthoscopic eyepieces known as the Fujiyama HD-OR lineup. These eyepieces are produced with a focus on maintaining the high standards of quality associated with Japanese craftsmanship. Manufactured at the company’s Tokyo facility, each Fujiyama HD-OR eyepiece undergoes a thorough inspection before being shipped, ensuring consistency in performance and reliability.

The Fujiyama HD-OR eyepieces are available in four focal lengths: 4 mm, 5 mm, 7 mm, and 12.5 mm. This final production run will be the last time these particular eyepieces are offered, marking the end of their availability after this month.

Fujiyama HD-OR eyepieces from Kokusai Koki

The name Fujiyama is derived from Mt. Fuji, a prominent symbol of Japan, reflecting the brand’s emphasis on tradition and quality. These eyepieces feature multicoated optics on all air-to-glass surfaces, which enhances light transmission and results in brighter images. The cemented lens surfaces are not coated, adhering to the design specifications that prioritize performance. Additionally, the lenses are edge-blackened, which minimizes internal light scatter and reflections. This design feature contributes to a clearer and more detailed viewing experience.

The Fujiyama HD-OR eyepieces are designed to be parfocal, meaning that when switching between eyepieces in this series, minimal to no refocusing is necessary. This characteristic is particularly beneficial during observing sessions, where time and effort can be conserved. The eyepieces are compatible with standard 1.25-inch astronomy filters, broadening their versatility in various observing conditions. Each eyepiece is supplied with plastic caps to protect the optics when not in use.

The chrome barrels of the Fujiyama HD-OR eyepieces are designed with a smooth-sided finish, a departure from the safety groove commonly found in other eyepiece designs. While the safety groove can prevent the eyepiece from accidentally slipping out of the focuser, it has also been known to be inconvenient for some users. The removal of this feature in the Fujiyama HD-OR series is a deliberate choice aimed at providing a smoother and potentially more user-friendly experience.

These eyepieces are characterized by their solid construction, which is intended to offer durability and longevity. The Fujiyama HD-OR series provides a 42-degree apparent field of view (AFOV), which is fully corrected to ensure sharpness across the entire field. The field stops in these eyepieces are precisely defined, which enhances the overall clarity and contrast of the views they provide. These attributes make the Fujiyama HD-OR eyepieces suitable for a wide range of astronomical observations, including planetary, lunar, solar, and double star viewing.

The Fujiyama HD-OR eyepieces are particularly well-suited for use with high-end apochromatic telescopes, where their optical qualities can be fully appreciated. These eyepieces are expected to be of interest to serious observers who require high precision in their astronomical equipment.

This final production run of the Fujiyama HD-OR eyepieces represents the culmination of Kokusai Kohki's dedication to producing high-quality optical instruments. With their combination of advanced coatings, edge-blackened lenses, and solid construction, these eyepieces are positioned as a desirable choice for discerning astronomers seeking reliable performance for detailed observations. The availability of these eyepieces is limited, with the current stock being the last that will be offered, signaling the end of an era for this particular product line.

Fujiyama HD-OR eyepieces lineup

Fujiyama 1.25" HD Ortho Eyepiece 12.5 mm

• Classical orthoscopic design 
• 42° apparent field of view
• Fully multi-coated 
• Bright image, very high sharpness, extreme contrast 
• Entire series parfocal.

Fujiyama 1.25" HD Ortho Eyepiece 4 mm

• Classical orthoscopic design 
• 42° apparent field of view
• Fully multi-coated 
• Bright image, very high sharpness, extreme contrast 
• Entire series parfocal.

Fujiyama 1.25" HD Ortho Eyepiece 5 mm

• Classical orthoscopic design 
• 42° apparent field of view
• Fully multi-coated 
• Bright image, very high sharpness, extreme contrast 
• Entire series parfocal.
   

Fujiyama 1.25" HD Ortho Eyepiece 7 mm

• Classical orthoscopic design 
• 42° apparent field of view
• Fully multi-coated 
• Bright image, very high sharpness, extreme contrast 
• Entire series parfocal.