Abrasion Resistant Lens Caps
Abstract
Various materials were tested for their suitability as abrasion resistant lens caps for binoculars as were the binocular lenses themselves. It was determined that artificial sapphire was the best material tested but because of high cost it was not considered suitable for protecting the objective lenses of ordinary binoculars. Optical glasses exhibit good properties and would be suitable lens cap materials. It was also determined that abrasion on the eyepiece lens or lens cap degrades the overall optical quality greater than a comparable degradation of the objective lens or lens cap. The polycarbonate and plexiglass materials were found to be very susceptible to abrasion and are considered to be unacceptable for lens caps.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1971
- Accession Number
- AD0890307
Entities
People
- E. S. Smierciak
- J. D. Price
Organizations
- Franklin Institute