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 All Optical Instruments are Design Around Focus

All optical instruments are design around focus; therefore it will always be a top priority in the formation of clear image. Magnification and brightness are of secondary importance, they are the result after focus is achieved. It is the critical distance of focus that determine the maximum magnification and brightness at which an image will be clearly viewed.

Magnification describes the action of converting smaller sight angles (true field) into larger ones (apparent field), this provide change in the angle at which the image rays are received, thus, tricking the brain into believing that the object is either closer or larger then it really is. If it wasn't for the need for focus, a single convex lens aEUR"a magnifier-would be a telescope capable of infinite zoom magnification, through the action of simply varying the distance it is held from the eye. Unfortunately, however, there is a critical distant at which images are focus through a single lens or even a system of lenses. This is also known as the critical distance of focus.

Company Resource:  Monocular Telescope Promotional Binoculars
Read more: http://www.nbbinoculars.com/blog/

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