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The Masuyama eyepieces are coveted for their clear, high-contrast views on a velvet black background and feature a "Hybrid Plössl" design with five elements. They have a much better edge of field performance and improved color performance compared to Plössls and other competing designs. Masuyama eyepieces achieve a high contrast through a much smoother cut than with all other premium eyepieces, as well as through internal diaphragms in the long eyepiece body.

The eyepieces go to the renowned optician Dr. Masuyama , who developed many of the best Japanese eyepieces from the 1960s and 1970s. Dr. Among other things, Masuyama designed an eyepiece with a focal length of 100 mm, which was used for visual observation on the historic 60-inch telescope at the Mount Wilson Observatory in California. After almost 30 years, the legendary Masuyama eyepieces are back in production. They are manufactured by Ohi Optical using the latest glass and multilayer technology made in Japan!