# Camera and Point Light

We recommend using the SmallRig RM-01 Waterproof Portable Photography Light. For a more even illumination, it is recommended to remove the internal Fresnel lens. See instructions [below](#diffusion-modification):

#### Diffusion Modification

1. Use a small allen key to open the front housing of the light. 
2. Carefully remove the fresnel lens. 
3. Reassemble the front cover. 

{% hint style="success" %}
This results in a softer and more uniform light distribution, reducing hot spots and improving surface consistency for photogrammetry. 
{% endhint %}

## Overview

1. [Light Output and Working Distance](#light-output-and-working-distance) - Tips on the type of asset to capture.
2. [Camera Setting Considerations](#camera-setting-considerations) - Control your camera settings.
3. [Markers](#markers) - Including if you have knocked a marker during scanning.
4. [Consistent Focus](#consistent-focus) - Focus on the subject, not the background.
5. [Overshooting](#pro-tip-overshooting) - It is better to overshoot and delete images later.

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### Capturing with a Point Light

Firstly it is important to make sure you have created the relevant presets for [exposure](https://docs.m-xr.com/marso-measure/resources/creating-an-exposure-calibration) and [light](https://docs.m-xr.com/marso-measure/resources/creating-a-light-system) calibration. Manual settings should be kept on at all times. 

{% hint style="warning" %}
Most point lights like the one we recommend above has limited output power, when the camera is positioned more than 0.5m away from your object, noticeable light fall-off may occur.
{% endhint %}

***

### Light Output and Working Distance

* As mentioned above, keep an eye on the light output and adjust the working distance. The light is best suited to **small objects and macro-scale capture.** 
* It is recommended to operate the light at **full power**.
* You can fit the light onto the **camera's hot shoe**, be sure to create the correct [exposure](https://docs.m-xr.com/marso-measure/resources/creating-an-exposure-calibration) and [light](https://docs.m-xr.com/marso-measure/resources/creating-a-light-system) calibration.

### Camera Setting Considerations

* Use a **low ISO** to minimise noise. 
* Use a **high f-number** (small aperture) to maximise depth of field.

Taking into account the above settings will mean:

* You will need to use a **slow shutter speed**. 
* A **tripod or rigid camera mount** to avoid motion blur.

### Markers 

Including markers in your scene will help for scale and camera alignment. We recommend taping down your markers to avoid any movement. 

Moved a marker during scanning?

* **If you a part way through a scan, and move a marker, but haven't taken more photos** - remove this marker from the scene and place it out of shot. This will avoid any issues when performing a 3D solve.
* **If you are part way through a scan, and have taken lots of picture of the markers moved** - either reshoot the capture, or make a note of which markers were moved, and remove them from marker detection when performing your 3D solve later.

### Consistent Focus 

* Ensure you're camera focuses on the subject not the background.

### Pro Tip: Overshooting

* It is better to overshoot and delete images when doing your 3D solve, than undershoot and not be able to go back to your location