Our highly rated D21 Eyepieces are matched to 1/100th focal length. Typically 21.6mm, they have a 65 degree AFOV, of course are fully multi-coated. Order WITH your Binotron 27 and we build your Bino USING your D21s for a perfectly matched optical system. They exhibit NO pin cushion distortion and produce amazing contrast whether used for nigh-time observations of planets, lunar and deepsky or daytime views in white light and H-a. They are amazing for H-a observations. We and many end users feel that the D21s are UNSURPASSED for contrast and sharpness on Ha!
Photo shows our D21 Eyepieces in a Binotron 27 Super System with Filter Switch (not included with D21 Eyepieces)
Specifications: Available Focal Lengths: 21mm & 14mm 1.25" Eyepiece Barrel format 65 degree AFOV Fully Multi-Coated on all air to glass optical surfaces for ultra-high-efficiency transmission High Index Japanese Glass utilized 20mm Eye-relief Black anodized aluminum housings and barrels with rubber knurled grip Laser engraved logo Rotating batwing Eye-Guards Weight: D21s: 8 oz each D14s: 9 oz each Full one-year warranty |
