Adjusting the eyecup

Here are the step-by-step instructions for adjusting the eye cups of a binoculars or monoculars with twist-up eye cups:

1. Hold the binoculars or monoculars in one hand and use your other hand to grasp the twist-up eye cup.
2. Rotate the twist-up eye cup counterclockwise to extend it or clockwise to retract it. It may take a few turns to fully extend or retract the eye cup.
3. Adjust both eye cups to the same level of extension to ensure proper alignment for your eyes.
4. Once you have the desired level of extension, test the adjustment by holding the binoculars or monoculars up to your eyes and looking through them. Adjust the focus as needed.
5. If you wear glasses, adjust the eye cups so that they are fully extended to create a longer eye relief. If you don't wear glasses, you may prefer to retract the eye cups for a more immersive viewing experience.

Use without glasses: When using without glasses, turn the eyecup out completely anti-clockwise.

Use with glasses: If you wear glasses, turn the eyecup clockwise all the way in.

Adjusting the correct interpupillary distance

1. Hold the binoculars or monoculars up to your eyes and look through them with both eyes open.
2. Adjust the eye relief by bending the centre axis of both halves of the binoculars until you see a single circular image with both eyes open.