Goethe in his “Farbenlehre” says in a survey of the hisrory of achromatic lenses that the practical and theoretical work of Boscovich and Steiner will not be forgotten; but Steiner's has ...
The PAC028 Visible Achromatic Doublet Lens is a 400 to 700 nm antireflection coated, 1/2 inch (12.7 mm) diameter, N-BK7 and N-SF5 precision achromatic doublet lens with an effective focal length of 50 ...
Huygenian Huygens eyepieces are constructed of two plano-convex lenses with both plane sides facing the eye. Periplan Periplan eyepieces are constructed of one achromatic doublet and two plano-convex ...
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