Question about Bushnell "Insta-Focus" Binoculars

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Hi, I bought "Bushnell Insta-focus 10x50 Sportview Binoculars" and the "B" knob (between the eyeglasses) just loosely spins and does not seem to have any affect on the viewing. Could you please tell me the purpose of this knob? And do you know what site has the Owners Manual so I can figure out how these work. I think I should have bought the machanical type of binoculars instead. Thank you for any help, Carla

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Posted on Jan 02, 2017

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IKnow
  • 68 Answers

SOURCE: lost installation disk for my bushnell binoculars

You should be able to find your driver here:
http://www.opticsplanet.net/printable-bushnell-8x21-digital.html

Posted on Jan 07, 2008

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informatica
  • 1114 Answers

SOURCE: Bushnell PowerView 13-1633 Binoculars

Hi - This called the diopter adjustment which compensates for small differences in focus between the left & right eyes.

See the following web page for adjusting :

http://www.birdwatching.com/optics/diopter_set.html

Please take a moment to rate this solution & let us know if the information given was useful to you - Good Luck!

Informatica

Posted on Sep 08, 2008

  • 112 Answers

SOURCE: Insta-Focus focusing problem

first open and close the binoculars untill they fit you eye width,now adjust left eye with the flat section located on the center hinge,now turn right eyepiece till clear. note: once you have adjusted right eyepiece you only have to leave it in that position in order to focus from near and far.........good luck......larry@reichinstruments.com

Posted on Nov 25, 2008

  • 112 Answers

SOURCE: bushnell binoculars /double image

they have to be aligned if you want mail them to me for an estimate..larry@reichinstruments.com

Posted on Apr 22, 2009

  • 73 Answers

SOURCE: unable to focus my Bushnell 7x35 insta-vision binoculars

If it just turns without making the bridge between the two eyepieces move up and down then they are broken. You will need to send them to Bushnell.

Posted on Jul 31, 2009

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Is my bushnell insta vision 7x35 or 10x50- how do I tell ?


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.

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Bushnell insta-focus mechanism gets stuck.


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...larry@reichinstruments.com

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1 Answer

Insta-Focus focusing problem


first open and close the binoculars untill they fit you eye width,now adjust left eye with the flat section located on the center hinge,now turn right eyepiece till clear. note: once you have adjusted right eyepiece you only have to leave it in that position in order to focus from near and far.........good luck......larry@reichinstruments.com

Nov 24, 2008 | Bushnell "Insta-Focus" Binoculars

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