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while effectively compensating for aberrations
8 ED SDM WR
A newly designed optical system featuring one ED (Extra-low Dispersion) glass optical element and two Anolamous Dispersion glass optical elements has been incorporated to minimize the generation of the unwanted purple fringe effect
The development of this new lens was based on the smc PENTAX-FA35mmF2AL — a very popular multi-purpose
XF Series Size:Eyepiece smc Pentax XF 8.5 (11/4” Tube) while effectively compensating for aberrationsDeveloped for exclusive use with the compact PF 65ED and PF 645EDA spotting scopes, the smc PENTAX XF series offers a choice of three distinctive eyepieces: two unifocal models with a long eye relief and a wide angle of view, and one zoom model with a 20 60X variable magnification range. When the rotatable eyecup is removed, they feature an adapter mounting screw (30. 5mm in diameter with a 0. 5mm pitch for the unifocal models, and 43mm in diameter