Guideline on Adjusting Binoculars
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The sad fact is that more than 90% of all the people who own binoculars don't have the slightest idea on how to focus and adjust them correctly. This is especially true regarding those center focus models that are so popular. You need to know that without correctly focusing the binocular, you are worse off than a person who didn't spend any money to buy a pair. Some of the most important things you need to be careful about when adjusting include:
Eyepiece spacing: The spacing between the pupils of most people's eyes ranges between 55mm and 75mm with an average of 66mm. start by holding your binocular at a normal viewing position and then, using your hands to hold the barrels, move them closer or farther apart until the images you are seeing from one circular field of view. If the set has an IPD scale, you may want to take note for future reference.
Eyecup height: Most modern binoculars come with adjustable eyecups and these normally serve dual purposes which are exclusion of extraneous sidelight as well as being able to position the eye pupils at the right distance from the eyepiece so you can have a full field of view. The eyecups should be in the up position for those people who don't wear eyeglasses and down position for glass wearers.
Focus the lenses: Usually there are three different focusing systems namely: the center focus with diopter adjustment; individual focus where every eyepiece is focused alone and; fixed focus where the lens is permanently pre-focused to a specific viewing distance. The most common types of binoculars are the center focusing variety; apart from the center focusing wheel, you will find a separate focusing diopter that helps to compensate for unequal vision that could exist between some viewer's eyes. The diopter adjustment normally has a scale marked with a (+) or (-) setting on the opposite sides of the marker. This may also have a focusing ring you will find located on the right hand side eyepiece or perhaps disguised as a different central focusing system.
Binoculars are such a powerful optical instrument whose intrinsic value lies with its ability to deliver sharp and bright images of the object you are viewing so that you can fully appreciate their details from a distance. This can only happen when the binocular is adjusted and focused correctly. The process of adjusting your binocular is sometimes complicated by the fact that apart from trying to view objects that are far off for which you need to make an allowance, you must also make adjustments to deal with any abnormalities in your eyesight.
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