Disassembling a pair of binoculars is a laborious process that requires patience and attention to detail. If you have an expensive or a new pair of binoculars, check with the manufacturer before tinkering with the unit. Only attempt to disassemble an old, damaged or inexpensive pair of binocular lenses. You'll need plenty of time and work space before you start the procedure. As you disassemble the binoculars, label every part, in case you want to reassemble the piece. The binoculars contains two (left and right) scopes, also referred as objective lenses.
Turn and remove the protective ring on the lens or the cap on the front end lens of the binoculars. There will be one cap wrapping each lens. If you find it hard to loosen the cap by hand, use a strap wrench. Do not use a crescent wrench or pliers, as this will badly scratch and possibly damage the rings.
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Unscrew the retaining lens with a spanner wrench. Once you remove the outermost cap, you will find a retaining ring gloving the objective lens.
Loosen the eccentric ring with a jeweler's straight slot screw driver that is no larger than 1.5 mm. The eccentric objective ring has one slot and is notched up inside the objective cell. It controls the movement of the objective lens. Twisting off the eccentric ring should free the objective cell, which is about 1 1/2 to 2 inches in length, depending on the binoculars, so you can remove it as well.
Twist off the objective bell housing with one hand, holding the objective cell firmly in the other hand. You can also set the objective bell house free using a strap wrench.
Repeat Steps 1 through 4 to disassemble the other scope.