Binos and Aging Eyes

The advantages of a big objective lens begin to diminish as we grow older.

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A dockside expert told me that larger objectives made binoculars brighter, and that his optical view was actually brighter than ambient conditions. The problem with that statement is that it violates the first law of thermodynamics: It is impossible for a self-acting machine, unaided by any external agency, to convey heat from one body to […]
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Drew Frye, Practical Sailor’s technical editor, has used his background in chemistry and engineering to help guide Practical Sailor toward some of the most important topics covered during the past 10 years. His in-depth reporting on everything from anchors to safety tethers to fuel additives have netted multiple awards from Boating Writers International. With more than three decades of experience as a refinery engineer and a sailor, he has a knack for discovering money-saving “home-brew” products or “hacks” that make boating affordable for almost anyone. He has conducted dozens of tests for Practical Sailor and published over 200 articles on sailing equipment. His rigorous testing has prompted the improvement and introduction of several marine products that might not exist without his input. His book “Rigging Modern Anchors” has won wide praise for introducing the use of modern materials and novel techniques to solve an array of anchoring challenges. 

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