Friday, September 27, 2013

What is ED Glass?

Dear Eagle Optics,
What does ED glass mean?

Thanks,

Colin M.
Columbia, MO

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Dear Colin, 
Thanks for your inquiry.

Standard grades of optical glass offer good image quality in ideal lighting conditions. For the best performance in low light situations, it is necessary to consider high grades of glass.
High-grade glass types, such as ED, FL, and HD, offer noticeably enhanced resolution and color fidelity. In addition, it controls chromatic aberration in the image.
  • ED: Extra-low dispersion glass
  • FL: Fluoride glass
  • HD: High-definition glass
The increased image quality from high-grade glass is especially obvious when viewing in low light.

Sincerely,

Eagle Optics

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