Harbor Freight Tools 94527 Introduction, Some Helpful Notes About Your Binoculars Magnification

Introduction

The use of binoculars help to expand your horizons by allowing you to see a distant object as if it were located very close to your eyes. When viewing sporting events, for trips, hunting, bird watching, hiking, boating concerts or theater, your binoculars will enhance your view of the world.

Some Helpful Notes About Your Binoculars

Magnification:

Your binoculars are marked with a set of numbers, 10 X 50. The first number represents the power or magnification of the binoculars, while the second number represents the objective diameter expressed in millimeters.

Magnification is defined as the amount of increase over the actual image size. A 7 x binoculars magnifies the image by 7 times life size, while a 10 x binoculars gives a 10 times magnification. For example, using 10 x binoculars, an object which is 100 feet away would appear to be only 10 feet away.

Objective Diameter:

The light gathering capabilities of binoculars are determined by the objective diameter. Binoculars with large objective diameters (above 50 mm) are designed for low-light conditions and astronomical use. Binoculars with small objective diameters (under 30 mm) are ideal in bright light. Binoculars that fall in the range between (30-50 mm) represent a good compromise between light gathering capability and size.

Field Of View:

The field of view is the extent of the area seen through the binoculars. It is expressed either in angular measure or in feet/meters at a range of 1,000 yards/meters. Thus binoculars with a field of view of 358 feet/119 meters will show you about 358 feet / 119 meters at 1,000 yards/1,000 meters. The greater the magnification, the less the field of view is.

The interpupillary distance of the eyes varies from 55 to 70 millimeters. The adjustment of the Binoculars to your individual interpupillary distance is made by bending the bodies about their hinges, thus increasing or reducing separation of the eyepieces until the two circular fields of view fuse into one.

Coating:

It is a well-known optical phenomenon that under normal conditions, a loss of over 5% of light occurs on passing through and air-to-glass surface. The coating on the lens surface of your binoculars eliminates this loss and restores the light to the transmitted beam. The coating has two advantages:

a.The image of field of view is considerably brighter due to the increased transmission of light.

b.Contrast and definition are improved because of the almost complete elimination of stray light reflected between the various lens surfaces.

Maintinance

Keep the rubber lens caps on the Binoculars and store in it’s carrying case when not in use. Use a soft lens cleaning cloth with lens cleaning solution to clean the lenses. A good camera shop should carry these items.

SKU 94527 For technical questions, please call 1-800-444-3353. Page 3