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LEARN about Bushnell Spotting Scopes

Spotting scope - A high-powered, compact optical instrument used to view distant objects like birds, wildlife, boats and landmarks.

 
Talk Spotting Scopes

Types of Coating
Exit Pupil
Eye Relief
Field-of-View (F.O.V.)
Folded Light Path

 
Magnification (Power)
Near or Close Focus
Objective Lens Size
Prism Glass
Prism Systems

 
Roof Prism System
Porro Prism System
Rainguard®
Resolution
Waterproof/Fogproof

Coated Optics
Coatings on lens surfaces reduce light loss and glare due to reflection, resulting in a brighter, higher-contrast image with reduced eyestrain. Bushnell® spotting scopes are coated with a microscopic film of magnesium fluoride. More coating leads 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 exit pupil refers to the size of the column of light that exits a spotting scope. The larger the exit pupil, the brighter the image. To determine the size, divide the objective lens diameter by the power. Thus, a 15x45 model has an exit pupil, or useable light, of 3mm (45/15 = 3mm).

Eye Relief
The distance a spotting scope can be held away from the eye and still present the full field-of-view. Extended or long eye relief reduces eyestrain and is ideal for eyeglass wearers.

Field-of-View (F.O.V.)
Field-of-view is 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 1000 yards or meters. A wide field-of-view is better for following fast-moving action or scanning for wildlife. Generally, the higher the magnification, the narrower the field-of-view.

Coated Optics
Coatings on lens surfaces reduce light loss and glare due to reflection, resulting in a brighter, higher-contrast image with reduced eyestrain. Bushnell® spotting scopes are coated with a microscopic film of magnesium fluoride. More coating leads 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 exit pupil refers to the size of the column of light that exits a spotting scope. The larger the exit pupil, the brighter the image. To determine the size, divide the objective lens diameter by the power. Thus, a 15x45 model has an exit pupil, or useable light, of 3mm (45/15 = 3mm).

Eye Relief

The distance a spotting scope can be held away from the eye and still present the full field-of-view. Extended or long eye relief reduces eyestrain and is ideal for eyeglass wearers.

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

Field-of-view is 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 1000 yards or meters. A wide field-of-view is better for following fast-moving action or scanning for wildlife. Generally, the higher the magnification, the narrower the field-of-view.

Folded Light Path

A combination optical configuration using lenses and mirrors to create a total scope length much shorter than the total focal length of the system. This provides a compact design yielding long focal length performance.

Magnification (Power)
Spotting scopes are often referred to by numbers separated by an "x". For example: 15–45x60. The first number is the power or magnification of the spotting scope. With a 15–45x60 variable power spotting scope, the object being viewed appears to be 15–45 times closer than you would see it with the unaided eye.

Near or Close Focus
The closest you can be to an object and maintain visual clarity. Multi-Position Eyepiece Bushnells exclusive multi-position eyepiece is available on our 78-7350 and 78-7360 Spacemaster® models. This revolutionary eyepiece features an infinite number of viewing positions between straight-thru and 90 degrees – providing flexibility for viewing comfortably in any situation.

Objective Lens Size
The number after the "x" in the formula: (15–45x60) is the diameter of the objective or front lens. The larger the objective lens, the more light that enters the spotting scope and the brighter the image.

Prism Glass
Most optical prisms are made from borosilicate (BK-7) glass or barium crown (BaK-4) glass. BaK-4 is the higher quality glass yielding brighter images and high edge-to-edge sharpness.

Prism Systems
The prism system turns what would otherwise be an upside-down image right-side-up.

Roof Prism System
The prisms overlap closely, allowing the objective lenses to line up directly with the eyepiece. The result is a slim, streamlined shape in which the lenses and prisms that magnify and correct the image are in a straight line.

Porro Prism System
The objective or front lens is offset from the eyepiece. Porro prisms provide greater depth perception and generally offer a wider field-of-view.

Rainguard®
Our exclusive, patented, hydrophobic (water-repellent) coating on which condensation from rain, fog or snow forms in much smaller droplets than on standard coatings. Smaller droplets scatter less light which results in increased light transmission and a clearer image.

Resolution
Resolution, or definition, is the ability of a spotting scope to distinguish fine detail and retain clarity.

Waterproof/Fogproof
Some scopes are sealed with O-rings and nitrogen-purged for waterproof and fogproof protection. These models are able to withstand complete immersion and remain dry inside.

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NVT Pty Ltd is a soley Australian owned company providing high quality goods and service throughout Australia and New Zealand. We supply optical equipment including, binoculars, telescopes, rangefinders, night vision and riflescopes and related accessories.. NVT is directly associated with leading websites such as Telescopeshop.com.au, Nightvisionshop.com.au and DillonPrecision.com.au. Please note: prices and configuration can change without notice.
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