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TAKAHASHI Astronomical Telescope Toe Series Eyepiece 2.5mm 3.3mm 4.0mm For Sale

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TAKAHASHI Astronomical Telescope Toe Series Eyepiece 2.5mm 3.3mm 4.0mm:
$404.99

TAKAHASHI Astronomical Telescope Toe Series Eyepiece 2.5mm 3.3mm 4.0mmDescriptionTOE is a newly designed short focal length eyepiece series from Takahashi. The TOE is designed to minimize various aberrations such as spherical aberration, chromatic aberration, curvature of image plane, astigmatism, distortion, and lateral chromatic aberration by using Takahashi's original 4-group 6-element lens configuration, in which the front group Smythe lens and rear group master lens are combined for optimization. In addition, the lens curvature is selected to minimize ghosting and flare, hardware is designed, broadband multi-coating is applied to each boundary surface of the lens, and flat multi-coating, which minimizes wavelength variation in transmittance, is applied to necessary surfaces to correct color balance, enabling observation of the moon and planets with high contrast images. The flat multi-coated surfaces also correct for color balance, minimizing variations in wavelength transmission.
Focal length Apparent field of view Eye relief Weight Mounting sizeTOE-2.5mm 2.5mm 52° 10mm 145g φ31.7mm TOE-3.3mm 3.3mm 52° 10mm 140g 31.7mm dia. TOE-4.0mm 4.0mm 52° 10mm 140g 31.7mm dia.Shipping

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