Question about Bushnell InstaFocus 25-283 Binocular

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Binocular focus issue

Busnell InstaFocus 7X50 binoculars dropped. Don't focus correctly anymore. Assume lenses out of sync. Worth repairing?

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You are right the prisms have probably shifted and it needs to be realigned, cost to realign for that model would cost about 35.00 plus shipping, if i can help any further please call 5088331232...larry

Posted on Jun 22, 2009

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INEED A MANUAL FOR TASCO OFFSHORE BINOCULAR OS36 7X50 RANGE FINDER COMPASS


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I see double image unless I take the lens as close as the binoculars can go


thats how binoculars are. Yours in this case is really strong. the closer you are to something, looking at it, the more magiflyed you going to be. try view things far a distance, really far away. no more double right?
Everything you need to know to become an expert:
on this website: http://www.chuckhawks.com/binocular_basics.htm
It is surprising how many people do not know how to focus binoculars correctly. There are two common focusing systems used in binoculars.
The first is individual eyepiece focus. This system is simple to understand, and easy to manufacture. It also lends itself well to sealed optical tubes, and thus is usually the focusing system used for waterproof binoculars. Individual eyepiece focus means that to focus the binoculars to your eyes, you simply focus the left eyepiece to your left eye and the right eyepiece to your right eye. There is no centrally located focusing mechanism. It is done like this. Look at something in the distance. Close the right eye (or cover the front of the right binocular), and focus the left eyepiece to your left eye. Close the left eye (or cover the front of the left binocular), and focus the right eyepiece to your right eye. You are finished, until you need to look at something at a different distance, in which case you need to repeat the process.
Because individual eyepiece focus is time-consuming, center focus is more common. Unfortunately, very few people understand how to correctly use center focus binoculars. Here is how it is done. Aim your binoculars at something in the distance. Close the right eye (or cover the front of the right tube), and focus the left side of the binocular to your left eye using the center focus control, which is concentric with the pivot shaft between the binoculars. (Note: the left eyepiece itself does not focus on center focus binoculars.) Next, close your left eye (or cover the front of the left tube), and focus the right eyepiece to your right eye. DO NOT touch the center focus control while you are focusing the right eyepiece to your right eye. Now you are finished. What you have just done is adjust the binoculars for your individual eyes. (Practically everybody's left and right eyes are different.) From now on, you only need to adjust the center focus control when you look at things at different distances. Center focus is faster and easier to use than individual eyepiece focus, once you have initially set the binoculars for your eyes.
Binoculars are commonly described by using a pair of numbers, as in "7x50" or "8x25." The first of these numbers refers to the magnification offered by the binocular. Magnification is why most people buy a pair of binoculars. In the examples above, "7x" means the binocular makes whatever you look at appear seven times closer than it does to the unaided human eye. "8x" means the binocular makes whatever you look at eight times closer than the unaided human eye. "10x" makes things look ten times closer, and so on. The first number used to describe binoculars always refers to their magnification. Common binocular magnifications are 6x, 7x, 8x, 9x, and 10x.
There are also variable power (zoom) binoculars, such as 7-21x50. These almost always perform much better at the low power setting than they do at the higher settings. This is natural, since the front objective cannot enlarge to let in more light as the power is increased, so the view gets dimmer. At 7x, the 50mm front objective provides a 7.1mm exit pupil, but at 21x, the same front objective provides only a 2.38mm exit pupil. Also, the optical quality of a zoom binocular at any given power is inferior to that of a fixed power binocular of that power. In general, zoom binoculars are not the bargain they seem to be.
Remember that everything (including movement) is magnified when you look through a pair of binoculars, especially your own shakes and tremors. So the higher the power, the harder it seems to hold the binoculars steady. 6, 7, or 8 power binoculars are easier for most people, even those with very steady hands, to hold reasonably still. The higher powers sound like a good deal, but often result in jiggly, blurred views. This is why 7x binoculars are chosen by so many experts, including the military.
Power affects brightness. Other things being equal, the higher the power, the dimmer the view. And power also affects the field of view of the binoculars. Again, everything being equal, the higher the power, the smaller the field of view. So, as you can see, power must be balanced against other desirable characteristics when choosing binoculars.

May 09, 2011 | Bushnell 240842 Binocular

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Double vision with the optics. Dropped and now the binocular has double vision.


The yoke which connects the eyepieces and keeps them aligned as the focus changes is damaged. If you can easily move one eyepiece back and forth with respect to the other then the yoke has broken, if not then it's bent, probably cracked and waiting to break.This is probably the most common fault on most binoculars, and it's usually uneconomic to repair.

If bent, the yoke *might* be able to be straightened, but it will be weakened and the alignment afterwards will rarely be spot-on. If broken, then the yoke must be replaced professionally but the repair often costs more than replacing the binoculars with new. The break cannot be simply glued: the contact area is too small to carry the loads it has to carry, and you also usually find that the yoke bent before breaking anyway so you then have all the same problems as you do with a bent yoke.

The fragile nature of the yoke is why binoculars must always be inserted into their case with the objective lenses facing down; this avoids shock loads on the delicate yoke assembly.

If you have a telescope and binocular repair specialist located conveniently to you then it may worth getting an estimate for repairs, but there are few these days with the skills to do so. Minolta no longer exist, so spare parts will be almost as scarce as rocking horse droppings. But if you're in the UK, then visit or phone Kay Optical for advice.

I hope that you've found my posting to be of use and in return ask only that you take a moment to rate my answer.

Feb 09, 2010 | Minolta Classic II Zoom Binocular

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I have one Bushnell binocular that was dropped and is now out of focus. Can it be repaired and if so, at what cost?


alignment would be around $35.00 plus shipping dont know if the model you have is worth it..if i can be of further assistance...capecod389@aol.com

Dec 02, 2009 | Bushnell Optics

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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

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Out of focus


Assuming you are focussing correctly. When binoculars are out of collimation the most usual effect is double vision as the optical axis do not line up. The only thing you can do is to take them to a binocular repairer. The problem is the cost. Proper repair need the use of a device known as a collimator and it is a laborious task to do it properly. Your binoculars do not carry a high monetary value and a proper repair will cost more than a new binocular of similar specs. Porro prism binoculars mostly have the objective lenses set further apart than the eyepieces. This holds true except for reverse porro prisms which are the other way round. Roof prisms have both the front and rear lenses inline.
Make sure when you focus that the first eye you use to focus with is the one where the eyepiece does not have its own focus ring (dioptre). The dioptre adjustment is on either the left or the right depending on the brand. That eyepiece should be left alone until you have focused using the center ring. Then leave the center ring alone and focus the eyepiece that has the adjustment ring.

Mar 12, 2009 | Optics

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I have a Minolta Weathermatic 7x50 binoculars that suddenly I cannot get in focus. Additionaly, I see double on everything I view.


really sorry about that godlen_po. I will report the problem to our support team. Anyways your binoculars requires cleaning. Though they are supposedly water proof they can be affected by conditions like humidity after prolonged use. You would need to take it to proffessional for cleaning. Do not I repeat do not attempt to clean it yourself using water or any other cleaning substance like soap etc., as you may damage the lenses permanently. I screwed up my binoculars this way only to know about cleaning later. If you need any help locating the nearest spot where you can get this fixed feel free to post back. I apologize once again for the incovinience caused. I will verify if its on my side and report to the support team.

Thanks,
Sai.

Dec 29, 2008 | Minolta Weathermatic Binocular

1 Answer

Docter binocular repair


depends where you are from. there are several in u.s. if you want i can give you an estimate to repair them .larry@reichinstruments.com

Nov 19, 2008 | Docter 10x42 Central Focus Binoculars

2 Answers

Binocular software


I would contact Radio Shack support (in Canada: The Source by Circuit City thesourcecc.ca ) for a replacement manual.

On a side note, how is the quality of this camera? Does it actually take pictures at full 8x optical zoom?

Apr 11, 2008 | Optics

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