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you cold try lubing it with the drip down method, squirt penetrating oil in the focus rack and hold so it flows into rack. They used a thick grease for damping, you may try heating it in an oven up to 130F for 5 minutes (or leave in a hot car) to soften grease and then actuating the focus to get the hardened grease back into the helix.
You have the classic signs of the most common binocular fault: a bent or broken eyepiece carrier yoke.
cause is usually due to the binos being dropped or the eyepieces getting knocked. The only cure is a replacement yoke, but the repair is
rarely cost-effective unless the binos are really expensive and
top-quality models. When last available new, yours sold for just over US$100 and repairs will typically far exceed that price.
yokes cannot be repaired: If bent, then it's near-impossible to unbend
them accurately enough and in any case the process will always either
break the yoke or will severely weaken it. Broken yokes cannot be glued
together as the contact point is just too tiny for the loads it carries,
and as it usually bends before breaking you'd simply end up with a bent
yoke afterwards even if you could glue them.
The number one rule is to never use oil on a binocular!!
I suspect that the multistart thread on the focus arm carrier, which is internal, has become gunged up. This is not an easy repair for a beginner. The rubber has to be removed from the body of the binocular before you can even start to take them apart to determine the fault.
Like any bearing or gear system, the part would have to be cleaned with a degreaser, then reassembled with new lubricant.
The first number is the magnification the second number is the size in millimeters of the objective (large lens) So if you measure the diameter of the front large lens that will give you the size. So a 10x50 means a magnifyng power of 10 and an objective of 50mm.
Now to find out the magnification if you don't know what it is. Measure the front lens. Then if you look through the eyepiece lens while holding it away from you you will see that there is in each a small circle of light. That it what is known as the exit pupil. It lines up with the pupil of your eyes when you have the binoculars pressed up against your eyes. Now measure the diameter of the exit pupil in millimeters. It will only be a small number.
To work out the magnification use this formula. Magnification = Objective size divided by the exit pupil.
So a 10x50 will look like this M = 50 divided by 5....therefore M =10 which is the magnification.
Both the 7x35 and 10x50 will have an exit pupil of 5mm. So if yours is one of these then all you need is the objective (large) lens size.
Difficult to answer specifically without knowing the model. But binoculars are designed to view objects in the distance. They all have a limit as to how close they will focus based on the magnification and design. Objective lenses that are far apart such as on a porro prism binocular will not focus very close. The nature of the design of having the objectives further apart than the eyepieces doesn't allow it. When trying to focus too close the image will appear blurred and double. That is the nature of the design. 9 feet or 3 metres is considered quite close to focus a binocular and is usually for a model designed to do this such as a roof prism where the objective lens and the eye lenses are inline. A specialty binocular such as the Pentax Papilo will close focus to 50 centimeters. It has been designed so that the objective (large lenses) lenses converge.
Take into account when focusing that binoculars are also designed to compensate for differences in each eye. One of the eyepieces either right or left will adjust seperately. For binoculars with a center focus ring. First focus using the center ring with one eye covered. The eye that should be covered is the one that doesn't have the adjusting eyepiece. When the image is clear close the eye you have just used and leave the center focus alone. Focusing on the same spot look through the eyepiece that adjusts and turn the eyepiece ring until the image is clear. Now all you have to do is focus using the center ring only as the binoculars are adjusted for each eye.
Some binoculars do not have a center focus and each eye will adjust seperately.
at the bottom hindge there is a nut you can remove . then take a long thin screwdriver and take off the screw that holds the eyepiece focus shaft. turn center wheel till eyepiece xbars come off body,carefull not to touch lenses. gl firstname.lastname@example.org