Orthoscopic eyepieces offer a particularly flat field of view with uniform sharpness from center to edge. They are therefore particularly interesting for observing the moon, the planets and, with a solar filter, the sun.
The eyepieces go to renowned optician Dr. Masuyama, who developed many of the best Japanese eyepieces of 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 in the historic 60-inch telescope at Mount Wilson Observatory in California. After nearly 30 years, the legendary Masuyama eyepieces are back in production. They are manufactured by Ohi Optical with the latest glass and multi-layer technology made in Japan!