Question about Bushnell H20 Series 10x26 Wp/fp Porro Prism Binocular 150126

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Repair bushnell h2o 10x25 porro prism binocular

How to reach the adjustment screw to align the two monoculars

Posted by Anonymous on

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Posted on Jan 02, 2017

SOURCE: The finderscope for the Bushnel

Obviously the mounting for the finderscope is NOT parallel with the tube-- probably the screw holes were not drilled correctly.

This is one of the reasons why we never recommend Tasco or Bushnell telescopes. They are considered "toy" telescopes and most of them are not suitable for Astronomy.

Return it and buy one of these:

http://www.telescope.com/control/product/~category_id=classicdobs/~pcategory=dobsonians/~product_id=08942

OR re-drill the holes so the finder scope is more parallel with the main tube.

Posted on Aug 28, 2010

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Can I get the plastic piece with left handed threads that screws onto the eye piece for the adjustable eyecup to ride on.


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How to get my single image back?


Although It may not appear to have prisms because of the sleek barrels, they do infact have roof prisms in them. Most likely one of the prisms is out of position. Bushnell typically has a great warranty so contacting them to have them repair it would be my recommendation. Here is there service group link: Bushnell Repair Services. If you need additional guidance do not hesitate to contact the folks at RCS Optics

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Lens alignment


generally under the edges of the covering at the eyepiece end there are tiny screws that are used to adjust the prisms in the binoculars, generally out of alignment issues are caused by the prisms being out of alignment.

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Accidentally dropped Bushnell Legacy WP 10 X 50 binoculars. Now they have a double image. Is this something that will need professional repair?


Yes, and unfortunately it will cost more than these binoculars are worth. What has happened is that one or more of the prisms inside the binoculars has shifted, putting them out of "collimation", or alignment.

You could have a go at this yourself, as a proper repair is not economic, but treat it as a learning experience.

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1 Answer

Double vision


I'm assuming you have set the dioptre correctly for your eyes.

Normally this is caused by a collimation error when one (or both) prisms move. This can be by a small amount.

Your going to have to take them in for service/repair to fix this as is not a DIY problem. (Unless of course you have a collimator lying around)

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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.

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