The Ultra Mode activates a very low read noise mode. Basically, it provides a higher signal to noise ratio, at the expense of a lower frame rate.
If you are using the camera through native integration, this setting will be called "Ultra Mode".
![OGMA Camera settings inside APT](/sites/default/files/media/image/Screenshot%202023-02-22%20120618.png)
If you are using the camera through the ASCOM driver, this setting is called "Low Noise".
![ASCOM USB 3.0 connection](/sites/default/files/media/image/ASCOM-USB3.png)