Definition of "refractors" [refractors]

• Plural form of refractor. (noun)

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• "Unlike some other major brands of inexpensive refractors on alt-azimuth mounts, we're looking at good quality here… thrust-bearing surfaces well lubricated and teflon bearings… the control knobs work easily and mechanically perfect to allow you to set just the right amount of tension to make everything work with ease."
• "It took a bit of reading to discover what the trouble was – chromatic aberration, endemic to all such primitive refractors."
• "And to make that happen, you need to position mirrors, beam splitters, refractors, polarisers and god knows what else."