# Focus Adjustments

Airscope supports different methods for adjusting the focal plane. The current method uses a spacer-based design; additional methods will be added in the future.

## Spacer-Based Focusing for Airscope

With baseplate v1, Airscope focus is adjusted by placing spacers between the Airscope module and the baseplate. Different spacer thicknesses change the focusing position. To adjust the focus, follow the steps below:

::::{grid} 1 1 3 3
:gutter: 3

:::{grid-item}
```{image} ../assets/images/AB1@4x.png
:alt: Place a spacer on the baseplate
:align: center
:class: narrow
```

Place a spacer on the baseplate.
:::

:::{grid-item}
```{image} ../assets/images/AB2@4x.png
:alt: Mount Airscope and check focus
:align: center
:class: narrow
```

Mount Airscope on top of the spacer and check the image focus in preview mode. If the image is not well focused, replace the spacer with a different thickness and check the focus again. Repeat this process until the best focus is found.
:::

:::{grid-item}
```{image} ../assets/images/AB3@4x.png
:alt: Fix Airscope onto the baseplate with screws
:align: center
:class: narrow
```

After finding the best spacer, record its thickness and use the same thickness for future experiments. Fix Airscope onto the baseplate using screws at the best focus position.
:::

::::

## Continuous Rotary Focusing

We also provide a rotary focusing mechanism for continuous focus adjustment after mounting. The mechanism uses a miniature precision screw system integrated into the baseplate, enabling 0–800 µm vertical displacement and continuous depth tuning without discrete step-size limitations.

*Credit: The rotary focusing mechanism was designed by Wenrun Song.*

```{image} ../assets/images/V1.2.gif
:alt: Rotary focusing mechanism in action
:align: center
:class: medium
```