Roof diopter ring adjustment
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Roof diopter ring adjustment
The first step with the Bushnells was to remove the focus wheel cover which easily popped off. Through the skeletonized face plate I could plainly see the two brass ends of the focus pushrods and they were slotted for adjustment. Again noting the beginning orientation I rotated the rod on the diopter adjustment side. The focus balance was clearly affected and I determined that a clockwise turn of the slot would alter the diopter adjustment back towards “0”. Next I set the diopter ring to a zero adjustment/setting and locked the ring down. I then focused so the left barrel was perfectly in focus. Next I rotated the diopter side slotted pushrod clockwise until perfect focus balance was achieved which required constant visual checks along the way. The result is that now with the diopter adjustment set in the middle on “0” there is perfect focus balance between the two barrels. The binoculars are zeroed for my eyes with equal room for adjustment either way if need be. Now that I think about it I have seen these slotted ends with other roof focuser mechanisms so I’d be confident this fix would be a common one.
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