Big objective lens—Here’s something everyone understands. The bigger that front lens, the more light it lets in. If you want to see what you’re aiming at in low, low light, get a giant objective lens!

The size of the objective lens you’ll choose depends on how much weight and bulk you’re willing to handle. For example a set of Vortex Razor HD 10×42 binoculars weigh 24.8 ounces. The 10×50 Razor HD ...

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The Future of Objective Lens Testing. Date Announced: 04 Jan 2011. Measuring lens centering, air spacing, and center thickness inside of assembled optical systems with a single instrument. The new ...

STAR Optical’s 6-inch (152 millimeters) f/10 achromatic objective lens features hand-figuring and full multicoatings. The optics come in a precision-machined, push-pull aluminum black-anodized cell.