Tip & How-To about Bushnell Optics

Blurry Binoculars?

If you are getting a blurred or double image through your binoculars don't throw them away.
Hold them at arms length and look at the spot of light coming from the ocular lens. If they are shaped like cats eyes they out of collimation but in most cases this can be fixed.
The prisms need realigning. This is done by tilting the binocular's prisms by making tiny adjustments to screws found under the binocular's outer armour. You could try this your self with a 2mm screw driver and a bit of trial and error or you could contact us at www.binocular-repairs.com for an estimate.
We have over 30 years experience in this field and have the technology and the spare parts to mend most makes and models of binoculars and telescopes.
I hope I can be of assistance.
Regards,
T.E. LockAssoc. DirectorOpticalia Ltd

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1 Answer

binoculars are blurred almost seem cross eyed


There are three adjustments to binoculars. The single eyepiece focus to account for differences between eyes, the central focus which focuses both optics for distance to subject, and finally adjusting the physical distance between the two eyepieces.

This page tells you about focus and calibration. Once that is done, adjust the distance between eyepieces so that your view is one large circle. Too narrow and the edges are clipped, too wide and you get a gap in the centre.

if none of that works, you need to have the binoculars professionally serviced.

How To Focus Binoculars

Apr 12, 2017 | Optics

1 Answer

every picture i take of still objects turn out really blurred


How do you hold your camera? Holding it at arms length and viewing the subject through the screen will practically guarantee a blurred image with most cameras. You might get away with it with cameras equipped with Image Stabilization but not compact digitals.
Use the view finder and hold camera firmly against your face. Frame your subject, take a breath in then exhale, stop breathing momentarily and squeeze the button. (Don't forget to start breathing again!) If possible rest your camera on or against a solid object while shooting.

May 18, 2011 | Cameras

1 Answer

I bought these for my husband. In trying them


Difficult to answer specifically without knowing the model. But binoculars are designed to view objects in the distance. They all have a limit as to how close they will focus based on the magnification and design. Objective lenses that are far apart such as on a porro prism binocular will not focus very close. The nature of the design of having the objectives further apart than the eyepieces doesn't allow it. When trying to focus too close the image will appear blurred and double. That is the nature of the design. 9 feet or 3 metres is considered quite close to focus a binocular and is usually for a model designed to do this such as a roof prism where the objective lens and the eye lenses are inline. A specialty binocular such as the Pentax Papilo will close focus to 50 centimeters. It has been designed so that the objective (large lenses) lenses converge.

Take into account when focusing that binoculars are also designed to compensate for differences in each eye. One of the eyepieces either right or left will adjust seperately. For binoculars with a center focus ring. First focus using the center ring with one eye covered. The eye that should be covered is the one that doesn't have the adjusting eyepiece. When the image is clear close the eye you have just used and leave the center focus alone. Focusing on the same spot look through the eyepiece that adjusts and turn the eyepiece ring until the image is clear. Now all you have to do is focus using the center ring only as the binoculars are adjusted for each eye.

Some binoculars do not have a center focus and each eye will adjust seperately.

Jul 29, 2009 | Optics

1 Answer

image appears double and slighly off when viewing


I was having a double vision problem with my Barska 10-30X50 zoom, 195FT/100YDS binoculars. One image was always higher than the other. This was tolerable at low zoom, but was further aggravated the more I zoomed in. I found that I could grasp both barrels and twist them in opposite directions (one side up, the other side down) and force the two images to merge--but that was a strain and an unpleasant viewing experience. As an experiment, while looking through the binoculars, I grasped the far end of the right barrel and twisted it on its axis. Nothing happened at first, but after a certain amount of resistance it began to rotate independently of the body. Lo and behold, this shifted the barrel's axis, and the image for that eye moved vertically! I turned it until the two images merged, and now I'm thrilled to say that the problem is solved! I don't have a clue if this would work on any other brand or model, but it's worth a try!

Apr 06, 2009 | Tasco Sonoma 16-840WA-1 (8x40MM) Binocular

1 Answer

blurred,double image


Hi,


These should still be well within warranty.. If you still have proof of purchase that will show the date which should be enough for the shop to honour the warranty.
Bushnell's warranty is 12 months everywhere..

Dec 14, 2008 | Bushnell Excursion Binoculars

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