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All Tasco Warranty is now ceased and it is a new ABO (USA) policy will be in effect as follows.
ABO (USA) will promptly repair or replace, as it deems most suitable at our option, the product which is defective in workmanship at the nominal cost of $35.00 per unit, within the continental USA, to cover for basic repair and return shipping & handling costs. Make your check payable to ABO (USA), INC.
New policy of ABO (USA) does not cover the parts, defects caused by improper handling, installation, maintenance, abnormal use, alteration, wear and tear or accident. You will be advised of the additional cost prior to any repair.
All costs associated with the shipment of the product to ABO (USA) are the responsibility of the product owner.
Repair Info....305-860-4858 customer service 305-859-2010
They are out of collimation, probably because one of the prisms has shifted a bit. This is usually caused by them taking a knock. Fixing them, if it can be done at all, is a skilled job, and Tascos are replaceable for less than the cost of repair, unless you can get it done under warranty (they would probably just send you new ones).
Chuck them away and replace them. Seriously. Your binoculars have suffered the most common fault which occurs to all makes and models: a bent or broken eyepiece yoke assembly.
If broken it cannot be fixed without replacing the whole yoke assembly, and on budget models like anything that Tasco sell it's cheaper to buy new and the spare part is probably unavailable anyway. If the yoke has bent then it's virtually impossible to unbend it without breaking it, and even if you do it's usually not accurate enough. So you try again and it breaks... On the rare occasions where you're lucky enough to get it right, the yoke has fatigue cracks and soon breaks regardless. Due to the loads involved and the tiny contact patch, gluing is a waste of time and usually just turns a broken yoke into a weak and bent yoke.
Given that you can now buy very good quality similar or superior binoculars from Bresser and others for around £10 to £15 new any kind of repair simply makes no sense. There's nothing wrong with cheap binoculars in general, but you have a simple choice; pay a lot for top quality models which then have full after sales and spares back up or pay very little and replace them more often. Even then, the yoke assembly for a high quality brand will pay for around six to eight complete new pairs of low cost binoculars. Your call...
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.
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!