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Out of focus

I have a pair of montgomery wards 7x35 with i think are porro prisims and i know how to shut down the right tube and focus with the center knob and then close the left tube and focus with the right eye piece . after i do this and try to focus with both lenses the binocs will not go into focus. according to what i have read so far it sounds like the collimation is not correct. what can i do? the binocs are very clean for such an old pair. thanks for any help. lance a.

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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.

Posted on Aug 02, 2009

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