Check the listing for details. Carson BX-42 FlashShield 42mm Anti-Reflective Device for Binoculars. Condition: New. Listed at 19.99 USD. Moreover, the Carson BX-42 FlashShield serves as a protective sun shade, blocking glare and safeguarding your binocular lenses from potential scratches and dirt. This effective, dual-purpose design ensures your binoculars remain in optimal condition, enhancing their longevity and performance.