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What You Need to Know About Riflescopes

November 5, 2009

A riflescope shows a bullet’s point of impact and makes far-off targets and surrounding objects appear closer than they are. A riflescope is recommended for safer, more precise shooting in the field and on the range.

 

Diagram of a riflescope

rifle_diagram

 

 

 

 

Coated Optics

Coatings on lens surfaces reduce light loss and glare due to reflection for a brighter, higher-contrast image while reducing eyestrain. Bushnell riflescopes (one of my favorites) are coated with a microscopic film of magnesium fluoride. More coatings lead to better light transmission.

 

Types of Coating

Coated – A single layer on at least one lens surface.

Fully Coated – A single layer on all air-to-glass surfaces.

Multi-Coated – Multiple layers on at least one lens surface.

Fully Multi-Coated – Multiple layers on all air-to-glass surfaces.

 

Exit Pupil

The size of the column of light that leaves the eyepiece of a scope. The larger the exit pupil, the brighter the image. To establish the size, divide the objective lens diameter by the power (a 4×32 model has an exit pupil of 8mm).

 

Eye Relief

The distance a scope can be held away from the eye and still present the full field-of-view. Bushnell riflescopes provide an extra margin of comfort and recoil safety with extended eye relief and soft neoprene eyepiece guards.

 

Field-of-View (F.O.V.)

The side-to-side measurement of the circular viewing field or subject area. It is defined by the width in feet or meters of the area visible at 100 yards or meters. A wide field-of-view makes it easier to spot game and track moving targets. Generally, the higher the magnification, the narrower the field-of-view. (more…)

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October 12, 2009

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