Quote:
Originally Posted by AG Hybrid
Those numbers would suggest a major difference between the common glasses used in telescopes, FPL-51 and FPL-53. But, how does that translate at the eyepiece or at the CCD chip? IS the color correction 15-20% better or does it scale differently?
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I would think the use of abbe numbers would apply to any lens elements used in optical design be it telescope, camera lens or an eyepiece. It is all about matching lens elements to achieve the focus of the incoming light to a single point. With eyepieces you want to achieve magnification whilst maintaining control over contrast, sharpness and color definition.
When designing eyepieces you still have issues like chromatic aberration and spherical aberration to correct for hence the need to match as close as possible the lens elements whilst trying to get and maintain the maximum light transmission.