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class="prefix prefixSilver">Discussion Comparing the Masuyama 25mm 52°, 25mm 65°, and 26mm 85° Eyepieces

Discussion in 'Eyepieces, Barlows, and Filters' started by AstronomyConnect, Nov 30, 2017.

Comparing the Masuyama 25mm 52°, 25mm 65°, and 26mm 85° Eyepieces

Started by AstronomyConnect on Nov 30, 2017 at 2:38 PM

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  1. AstronomyConnect

    AstronomyConnect Staff

    Mar 20, 2015
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    Los Angeles, California

    The original Masuyama eyepieces were produced in 13 focal lengths from 100mm to 5mm. Except for the longest focal lengths, they had apparent fields of view (AFOV) of 52° with the 25mm being produced in both 52° and 65° AFOV models. Over the years, they’ve gained a cult following with their distinctive body design and reputation for starkly contrasted views with inky-black backgrounds. Today, the rebirth of the Masuyamas by Ohi Optical Manufacturing Co. Ltd. of Kawasaki, Japan are with larger AFOVs of up to 85°, more appropriate to modern tastes. While the line may still be expanding, as of 2017 they have released five 2" formats in focal lengths of 60, 50, 45, 32, 26mm, one 1.25" in 16mm, and one 3" in 80mm.

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