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Spectacle / Dioptre Adjustment

Binoculars & Adjustment..

Dioptre adjustment is the process of calibrating the binoculars to match the specific visual requirements of the individual user. This is accomplished by adjusting the dioptre, which is a measure of the refractive power of the lens in the binoculars.

The dioptre adjustment allows you to compensate for any differences in visual acuity between your left and right eyes, which is important for achieving a clear and comfortable image through the binoculars.

To set the binocular dioptre adjustment, follow these steps: Note some binoculars use slightly different mechanical systems to adjust the dioptre but the principle is the same. If you encounter any problems adjusting your optics a Focalpoint staff member would be happy to assist you.

  1. Start by adjusting the interpupillary distance (IPD), which is the distance between the centers of the pupils in your eyes. This can be done by adjusting the hinge mechanism that connects the two barrels of binoculars. To do this, hold the binoculars up to your eyes and adjust the hinge until the image you see through the binoculars is a single, clear circle.

  2. Once the IPD is set, close your right eye and focus the binoculars using the center focus wheel on the left side. Adjust the wheel until the image you see through the left eyepiece is sharp and clear. TIP: If you are struggling to close one eye then simply put the objective cap over the objective lens not being used for the adjustment. Or cover it with your hand.

  3. Now, close your left eye and adjust the right eyepiece by rotating the dioptre adjustment ring until the image you see through the right eyepiece is also sharp and clear.

  4. Finally, check the focus of both eyepieces by looking through both eyes at the same time. The image should appear clear and in focus.

It is important to note that the dioptre adjustment only needs to be set once unless your vision changes significantly. Once the adjustment is set, you can use the center focus wheel to quickly adjust the focus for objects at different distances. TIP: check your dioptre position hasn't moved with use or by someone else using your optic, you could mark the position for reference and easy resetting of the dioptre.


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