Question about Pentax Optics
One image seems to be above the other
Posted by Anonymous on
Alignment of pentaprism, you need to send it in or if its a goner, try it yourself. Unscrew one of the objective barrels and observe the pentaprism mounts. They may be in screw driven supports. adjust screw one at a time to see if you can get it back into alignment.
Posted on Aug 18, 2015
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Posted on Jan 02, 2017
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!
Posted on Apr 22, 2009
Up close to the eyepieces around the barrels are small screws that you can use to "collaminate" your binocs. The screws aren't meant to be accessed by the owner and most manufacturers cover them up with the material that surrounds the binocs. Of course the binocs in their current state are useless anyhow, so I wouldn't hesitate to peel up the material to look for the screws. If you do it carefully, you can reseat the material anyhow. Then once you locate the small screws, put the binocs on a stand or a table outside. Focus on something far away using one eye. Then using both eyes, you adjust the screw on the other eyepiece while looking through the binocs. Adjust until you get a single image. You can use loctite, or nail polish to "glue" the screw in the final position if it is really loose.
Posted on May 09, 2009
SOURCE: 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 easily the
most common fault on most binoculars, and it's always uneconomic to repair on budget brands such as Bushnell.
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 will cost more than replacing the binoculars with new. In any case, it's unlikely that Bushnell even list the spare part for it. 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.
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.
Posted on Feb 13, 2010
The same happened to my Mizar 10X25 I tried things like moving the front lenses but then I discovered that most probably the binoculars fell on one of the four corners, this caused the tubes' direction to be twisted. It could be that the left is pointing slightly down or the right is pointing slightly up, which is essentially the same, and which is what happened to mine. You can discover this miss-alignment by watching using both eyes and then close and open one of them the phantom image will appear and disappear. What you have to do is apply a force with your hands twisting the binoculars one tube up and the other down and hold where you can see clear, I just discovered this and it works, I think I should be able to re-align them again, but I haven't faund how to do so. If you find a different solution please let me know here: email@example.com
Posted on May 18, 2010
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