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Bushnell PermaFocus 10x50 porro

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Bushnell PermaFocus 10x50 porro Details

The combination of the 10x magnification and large 50mm lenses produces a binocular that can perform well over longer distances and which will not let you down in sub-optimal light conditions. This is why they make a popular choice for many astronomers, birders and hunters and why they are an ideal choice should you often find yourself out in the field or even in thick forests before sunrise or just after sunset.
For those that also carry other gear like a bow, rifle or camera, the lack of having to change focus makes them much easier to use with a single hand, which at times can be very important.
These binoculars are also tripod adaptable should you require a totally shake-free image.

About Bushnell PermaFocus Binoculars

Always in focus, the PermaFocus series makes it both easier and quicker for you to find and then enjoy a clear, sharp image without the need to adjust any focusing wheel. 
This creates a far simpler instrument to use, they are less cumbersome, there is less to go wrong and they are generally more lightweight. This feature is also very handy in any situation like many sporting events, hunting or birding activities where the time it takes to clearly view your subject is important.
With both porro and roof prism models available, each with a selection of size and power options, these binoculars are also suitable in a number of other scenarios like travel, safaris, hiking, general wildlife viewing as well as astronomy.

Important Features

These binoculars all sport a protective rubber coating on the exterior of the chassis. As well as protecting the optics contained within, the rubber improves grip and helps you remain undetected by both muffling sound and ensuring less light gets reflected off the surface. Roof prism models come with twist-up eyecups, whilst the porro prism versions have the more simple fold-down rubber design, but which some users prefer as they can block more light from the periphery of the view. The larger and more powerful porro prism models are also tripod adaptable which at high magnifications can be important achieve a completely shake-free image.

Optical Properties

The defining feature of this series is the focus-free optical design, that works because it has a very long depth of view and thus everything from around 12 to 15 meters away (depending on each individual), all the way up to infinity will always be in focus. 
An entry-to-mid level range, Bushnell have used BK-7 optical glass to make both the porro and roof prisms. The lenses on these are described as “Fully Coated”. This implies that all lens surfaces have been treated with a material that has special anti-reflection properties and which is designed to reduce undesired light reflections and thus help produce a brighter and better quality view. This is a big improvement on single coated instruments, but it is important to note is that higher specification ranges, like the Bushnell Legend Series, for example, are “Fully Multi-Coated”, meaning that more than one layer of this material is added to each surface which achieves even better results.


All Bushnell PermaFocus binoculars are supplied with a soft, protective carry case, objective and eyepiece lens caps, a neck strap, cleaning cloth and user instructions.

Features of Bushnell PermaFocus Binoculars

  • Fixed / Always in Focus Binoculars
  • Roof & Porro Prism Options
  • Protective Rubber Armor 
  • Fully Multi-Coated Optics
  • BaK-7 Prism Glass 
  • Twist-Up Eyecups on Roof Prism Models

Accessories of Bushnell PermaFocus Binoculars

  • Protective Carry Bag
  • Neck Strap
  • Objective Lens & Eyepiece Caps
  • Cleaning Cloth

Warranty Terms and Conditions

10 year warranty is included with all Bushnell PermaFocus series binoculars.

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Bushnell PermaFocus 10x50 porro Specifications

Binoculars seriesBushnell PermaFocus
Prism type Porro
Variable magnification No
Magnification 10x
Lens diameter 50 mm
Exit pupil 5.0 mm
Eye relief 12.0 mm
Field of view 98 m / 1000 m
Field of view (deg.)
Apparent field of view (deg.)
Close focus
Twilight Factor
Relative Brightness 25.0
Light transmission
Lens coating Fully Multicoated
Diopter range
Focusing system Permanent focus
Filled with -
Waterproof No
Fogproof No
Floatable No
Temperature range
Built-in rangefinderNo
Compass No
Image stabilizer No
Interpupillary distance
Weight400 g
In production since
Warranty10 years
Made inChina
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