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These latest designs from Takahashi incorporate the classic Abbe Orthoscopic master lens groups with a new ED-glass doublet to produce an ultra-high contrast, high resolution eyepiece with longer eye-relief and considerably more comfort than traditional Abbe lenses. All air-glass surfaces are multicoated formaximum light transmission and contrast.
Both the 3.6mm and the 2.8mm have six elements in three groups and an apparent field of 40 and 42 degrees respectively. Color correction is superb and off-axis aberrations are essentially non-existent.
These eyepieces are designed to allow the owner of a SKY-90 or FSQ-106 to obtain the higher magnifications required for high resolution planetary and double star observations without sacrificing contrast or image quality.