Masuyama Eyepieces
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The eyepieces were developed by renowned optician Dr. Masuyama. Among other things, Dr. Masuyama designed an eyepiece with a focal length of 100 mm, which was used on the historic 60-inch telescope at Mount Wilson Observatory in California. We are pleased to offer you these legendary eyepieces with the latest glass and coating technology.
- Eyepiece size: 3 inch (76.2mm)
- Eyepiece brand: Kokusai Kohki
- Eyepiece series: Masuyama
- Apparent field of view: 52°
- Focal length (mm): 80mm
This Masuyama premium planetary eyepiece from Japan offers the best contrast, improved color rendition and better sharpness at the edge.
- Focal length 10 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without locking groove, with filter thread
- 5 elements in 3 groups
- Latest lenses and multi-layer coating technology
- Developed and manufactured by Ohi Kohki Co. in Japan
- Made in Japan
This Masuyama premium planetary eyepiece from Japan offers the best contrast, improved color rendition and better sharpness at the edge.
- Focal length 12.5 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without locking groove, with filter thread
- 5 elements in 3 groups
- Latest lenses and multi-layer coating technology
- Developed and manufactured by Ohi Kohki Co. in Japan
- Made in Japan
This Masuyama premium planetary eyepiece from Japan offers the best contrast, improved color rendition and better sharpness at the edge.
- Focal length 15 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without locking groove, with filter thread
- 5 elements in 3 groups
- Latest lenses and multi-layer coating technology
- Developed and manufactured by Ohi Kohki Co. in Japan
- Made in Japan
This Masuyama premium planetary eyepiece from Japan offers the best contrast, improved color rendition and better sharpness at the edge.
- Focal length 20 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without locking groove, with filter thread
- 5 elements in 3 groups
- Latest lenses and multi-layer coating technology
- Developed and manufactured by Ohi Kohki Co. in Japan
- Made in Japan
This Masuyama premium planetary eyepiece from Japan offers the best contrast, improved color rendition and better sharpness at the edge.
- Focal length 25 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without locking groove, with filter thread
- 5 elements in 3 groups
- Latest lenses and multi-layer coating technology
- Developed and manufactured by Ohi Kohki Co. in Japan
- Made in Japan
This Masuyama premium planetary eyepiece from Japan offers the best contrast, improved color rendition and better sharpness at the edge.
- Focal length 30 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without locking groove, with filter thread
- 5 elements in 3 groups
- Latest lenses and multi-layer coating technology
- Developed and manufactured by Ohi Kohki Co. in Japan
- Made in Japan
This Masuyama premium planetary eyepiece from Japan offers the best contrast, improved color rendition and better sharpness at the edge.
- Focal length 5 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without locking groove, with filter thread
- 5 elements in 3 groups
- Latest lenses and multi-layer coating technology
- Developed and manufactured by Ohi Kohki Co. in Japan
- Made in Japan
This Masuyama premium planetary eyepiece from Japan offers the best contrast, improved color rendition and better sharpness at the edge.
- Focal length 7.5 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without locking groove, with filter thread
- 5 elements in 3 groups
- Latest lenses and multi-layer coating technology
- Developed and manufactured by Ohi Kohki Co. in Japan
- Made in Japan
Masuyama premium eyepieces from Japan offer best contrast, improved color rendition and better sharpness at the edge.
- Focal length 10 mm
- Apparent field of view 85°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without safety groove with filter thread
- 5-element design
- Latest glass types and multi-layer coating technology
- Made in Japan
Masuyama premium eyepieces from Japan offer best contrast, improved color rendition and better sharpness at the edge.
- Focal length 16 mm
- Apparent field of view 85°
- Rubber eyecup for comfortable support of the eye or glasses
- 1.25" barrel without safety groove with filter thread
- 5-element design
- Latest glass types and multi-layer coating technology
- Made in Japan
Masuyama premium eyepieces from Japan offer best contrast, improved color rendition and better sharpness at the edge.
- Focal length 45 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 2" barrel without safety groove with filter thread
- 5-element design
- Latest glass types and multi-layer coating technology
- Made in Japan
Masuyama premium eyepieces from Japan offer best contrast, improved color rendition and better sharpness at the edge.
- Focal length 50 mm
- Apparent field of view 53°
- Rubber eyecup for comfortable support of the eye or glasses
- 2" barrel without safety groove with filter thread
- 5-element design
- Latest glass types and multi-layer coating technology
- Made in Japan
Masuyama premium eyepieces from Japan offer best contrast, improved color rendition and better sharpness at the edge.
- Focal length 60 mm
- Apparent field of view 46°
- Rubber eyecup for comfortable support of the eye or glasses
- 2" barrel without safety groove with filter thread
- 5-element design
- Latest glass types and multi-layer coating technology
- Made in Japan
Masuyama premium eyepieces from Japan offer best contrast, improved color rendition and better sharpness at the edge.
- Focal length 20 mm
- Apparent field of view 85°
- Rubber eyecup for comfortable support of the eye or glasses
- 2" barrel without safety groove with filter thread
- 5-element design
- Latest glass types and multi-layer coating technology
- Made in Japan
May 30 2025
Masuyama premium eyepieces from Japan offer best contrast, improved color rendition and better sharpness at the edge.
- Focal length 26 mm
- Apparent field of view 85°
- Rubber eyecup for comfortable support of the eye or glasses
- 2" barrel without safety groove with filter thread
- 5-element design
- Latest glass types and multi-layer coating technology
- Made in Japan
Masuyama premium eyepieces from Japan offer best contrast, improved color rendition and better sharpness at the edge.
- Focal length 32 mm
- Apparent field of view 85°
- Rubber eyecup for comfortable support of the eye or glasses
- 2" barrel without safety groove with filter thread
- 5-element design
- Latest glass types and multi-layer coating technology
- Made in Japan
Features Masuyama Ortho Plössl (MOP) eyepiece 35 mm 53°
- Focal length: 35 mm.
- 53° apparent field of view (AFOV).
- Eye relief: 23.5 mm.
- Modified Plössl optical design with 5 lenses in 3 groups.
- FMC - Fully Multi-Coated optical treatment.
- High refractive index lenses for excellent containment of chromatic aberration.
- Blackened lens edge.
- Retractable rubber lens hood.
- Standard 2"/50.8 mm barrel with threads for in-cell filters.
- Size: 53 mm OD x 104 mm L.
- Weight: 300 g.
- Japanese manufacture with the highest quality standards (Ohi Kohki Co., Ltd.).
Features Masuyama Ortho Plössl (MOP) eyepiece 35 mm 53°
- Focal length: 35 mm.
- 53° apparent field of view (AFOV).
- Eye relief: 28 mm.
- Modified Plössl optical design with 5 lenses in 3 groups.
- FMC - Fully Multi-Coated optical treatment.
- High refractive index lenses for excellent containment of chromatic aberration.
- Blackened lens edge.
- Retractable rubber lens hood.
- Standard 2"/50.8 mm barrel with threads for in-cell filters.
- Size: 53 mm OD x 115 mm L.
- Weight: 320 g.
- Japanese manufacture with the highest quality standards (Ohi Kohki Co., Ltd.).
