Question about Bushnell Optics
HAVE A PAIR OF BUSHNELL ENSIGN ZOOM LENS 7-15X-35 --- FIELD @ 7X300 AT 1000 YDS.
ZOOM LEVER ON RIGHT HAND SIDE HAS BROKEN OFF
DURING A FALL-- CAN IT BE REPAIRED? (IT'S NOT THE ZOOM INSTA-FOCUS 'ROCKER' LEVER IN THE MIDDLE, BETWEEN THE 2 LENSES)--- HELEN.
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Posted on Jan 02, 2017
SOURCE: double vision
The distance between the centers of the eyepieces of your binocular must be the same as the distance between your pupils. This distance is adjusted as follows: 1. Focus on a distant object. 2. Pivot the two halves of your binocular farther or closer apart until you can see a single unobstructed, circular field of view. Make sure to focus on a distant object when you do this because when you focus on a close object you always see two slightly overlapping circular fields. Your binocular may have a scale on the top, between the eyepieces, to help you remember this setting.
Posted on Aug 04, 2007
they were famous for that, because the screwpin that holds the eyepice shaft is metal and the groove that it rides in is plastic, and eventually gets jammed....look where you put your fingers to adjust eyepieces. should be small metal plate in center of hinge(sometimes with bushnell logo) that will simply pry off by using small screw driver,and now you will be able to see if the screw is loose or damaged. good luck...firstname.lastname@example.org
Posted on Jan 16, 2009
The first number is the magnification the second number is the size in millimeters of the objective (large lens) So if you measure the diameter of the front large lens that will give you the size. So a 10x50 means a magnifyng power of 10 and an objective of 50mm.
Now to find out the magnification if you don't know what it is. Measure the front lens. Then if you look through the eyepiece lens while holding it away from you you will see that there is in each a small circle of light. That it what is known as the exit pupil. It lines up with the pupil of your eyes when you have the binoculars pressed up against your eyes. Now measure the diameter of the exit pupil in millimeters. It will only be a small number.
To work out the magnification use this formula. Magnification = Objective size divided by the exit pupil.
So a 10x50 will look like this M = 50 divided by 5....therefore M =10 which is the magnification.
Both the 7x35 and 10x50 will have an exit pupil of 5mm. So if yours is one of these then all you need is the objective (large) lens size.
Posted on Aug 04, 2009
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