You could also search on the internet for a diagram of your binocular model. The manufacturer may have uploaded this at some point. Manufacturers usually recommend that customers don’t try to adjust the collimation themselves because it’s easy to mess up the calibration of the binoculars. This is why they hide the screws.
If there are no screws to take off the housing, then don’t force it off or you could break the binoculars.
Be very careful when using a razor. Wear thick gloves to avoid cutting yourself. You’ll probably scratch the binocular casing while you’re peeling the adhesive back, but this is only a cosmetic problem that won’t affect the performance. Just make sure to keep the blade away from any lenses.
You could make a makeshift tripod by taping the binoculars to a camera or telescope tripod. A stationary piece of wood could also work.
It’s possible to do this during the day on other objects besides stars. If you do this, pick a solid, stationary object that’s at least 1 km (0. 62 mi) away. [7] X Research source
If the collimation is very off, then the star you pick might look like 2 stars. Look away from the binoculars while you’re focusing to make sure you’re looking at 1 star. A popular target is Polaris, or the North Star. If you’re in the Northern Hemisphere, you should be able to find it on clear nights. Don’t use a large object like the moon. This is too large to see the fine adjustments you’ll have to make.
If the focused star sits right in the middle of the unfocused one, then your collimation is fine. No need to make more adjustments. Even if the double-vision is obvious before you defocus the lens, this makes aligning the images much easier.
There is a lot of trial and error in adjusting the prisms, so be prepared to turn the screws back and forth multiple times to find the right position. Even professionals need a few tries to get it right. Because the binoculars use prisms, turning the screws won’t move the image straight in any direction. Rather, they’ll make the images move diagonally left or right. This makes adjusting the image tricky.
It’s important to only adjust halfway because the image quality will fall if you only adjust 1 side. The 2 sides should be equally adjusted to preserve the picture.
The binoculars might still need vertical adjustment, meaning the images won’t be centered yet. When the images start getting further from each other again, then you’ve done all the horizontal adjustment you can.
For a quick test to see if the collimation is better, close your eyes for 5 seconds, then open them again. If the star still looks like a single image, then your collimation is good. If it looks like 2 images that quickly come together, then you still need more adjustment.
