Specifically, what do I need to do to fix double vision in my 10-x25 Cabela's wide angle binos? I believe they were dropped.

If there has not been a major blow, it is in most cases straightforward to align that double image.
Begin by looking if any of the eyepieces or front tubes are jammed, if so they need to be straightened or replaced.
Another problem is if something rattles, and if you notice that it affects the double image. It could for example be the prism holders, or the front lens of the eyepieces. If you are lucky it is just the adjustment screws not being properly screwed in, see below, otherwise this problem needs to be taken care of firsthand.
For adjustment of the double image binos come with three more common options. There are in some cases concentric adjustment rings around the front lenses. More frequently on porro binos there are adjustment screws on the prism housing. You find them under the front and rear edges of the rubber fascia. Or with roof prism binos you often adjust the angle of the eyepieces with in that case adjustment screws on their periphery
To adjust you first pull the two tubes apart a little, look then at something with horizontal and vertical lines in the distance, for example a building. The image will look like bino views in a movie film, with two different circular fields of views kissing each other in the middle.
It is easy to see malalignment for horizontal lines as they go from left to right. These are also the most important to adjust. For vertical lines you need to scan left and right and see if the image jumps sideways. This direction is actually not totally necessary to get perfect, the eyes can slightly adjust for this, but at the price of fatigue.
Be careful and make small adjustments at a time. You should be done in a few minutes.

this is a common proplem with binoculars that have been dropped. needs to be taken apart and realigned. trouble is some binos today are not worth the time or cost to repair if they were made in china, more of a toy...to realign would cost you at least $35 plus shipping..if i can help further? [email protected]

It's there to help you set the binoculars quickly to your own inter-pupillary distance. Just make a note of the number the pointer on the scale is at when you find a comfortable setting for your eyes and then when you next use them just set the pointer back to the same number. The scale is the angle of the yoke, and you'll often (but not always) find that the scale works on other makes and models as well to help you quickly set the binoculars up to your own preferences. The left eyepiece will also have a dioptre scale (not always accurate) so when you have sharp right eye focus, adjust the left eyepiece until you get sharp left eye focus as well.The scale on the eyepiece indicates how many dioptres (+/-) your left eye is different to your right eye. If you know the left eye setting and the yoke angle, you can quickly adjust most binos to your own comfort settings. Fixed focus binoculars are different in that they have dioptre adjustment on both eyepieces, so left eye settings from regular binos are not directly useful on fixed focus binos, but the yoke angle may still apply.

Try grabbing the binoculars in both hands and twisting the body in the opposite direction of the double vision until the images coincide.

Your question is listed under "Zhumell Oberwerk 45 25x100 Astronomy binoculars". If these are what you have then they're an extremely high end expensive specialist item and will need professional realignment. I'm assuming that if you do own a pair of these then you're knowledgeable enough to have done all you can to adjust them correctly.

I suspect that you have a regular pair of 10x50 or similar binoculars, with a centre focus wheel and hinges. If this is the case then try to wiggle one of the eyepieces back and forth: if you can easily move it and the other eyepiece remains steady then you have a broken hinge. This is a very common fault especially if your binos have been dropped or if they've been stored in their case upside down (i.e.standing on the eyepieces).

A broken hinge is normally a write-off as there is rarely sufficient area to us epoxy glue on and the metal used is not usually suited to being brazed. Even when the hinge can be repaired it's normally permanently misaligned.

Either resign yourself to using one half of your binoculars or buy a new pair. In the UK LIDL regularly sell a pair of Meade 10x50 binos of excellent quality for just over £10 and that's only a little more than a bottle of epoxy resin glue costs. You may be interested to know that one of the world's most successful supernova spotters does so in his back garden in the UK using just half a pair of old 7x50 binos.

take it into an outdoor shop and they can check the mirror alignment, seems that it may have "altered' itself

have repaired these before....have to be collimted...not the best bino for the buck, but would cost about 45.00 with shipping...larry 5088331232

thought i answered this before but at my age who knows....the problem is water contains minerals that will eventyaully corrode the optics or at least the coatings.anyway if you want i can give you an esimate to [email protected]

you dont say why you cant focus.is it a frozen center wheel,double vision,or not sharp?dont know where yor from but a good tech. could tell you in a minute.bell and howell is not an expensive glass and may not be worth cost of repair if damage is severe.hope this [email protected]

No, the wide angle and telephoto extension lenses are specifically designed only to extend the focal length of the existing E-10/20N lens. Their specific purpose is to be a fixed focal length.