Focus-Free Optics
There has been an upsurge in focus-free optics for hunters and bird watchers in the last year. On the surface, it seems like a great idea. Manufacturers simply set the focus at a single plane. The farther the plane of focus, the wider the depth of field.
The problem with focus-free optics is eye fatigue. At distances outside the focus plane, the muscles in your eyes flex to accommodate for the out-of-focus image. Over time, this creates fatigue and limits your ability to glass for long periods of time. It also sets an artificial focus for your eyes. When you pull off the scope, your eyes require their normal focus. This change takes several seconds and may make you lose sight of your target for just a moment – which is all it takes sometimes to ruin a hunt.
Pass on the focus-free optics unless you are certain that your hunting/watching distance will be near your scope/binocular focal plane.
Focus-free optics can be rough on the eyes
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Category: Dr Shawley's Blog
i love binoculars that are made by Bushnell, they are really very high quality,’*