CCDciel is free software released under the terms of the
GNU General Public License
This tool is to set the sensor area used for imaging.
The first row is the horizontal starting point and width.
The second row is the vertical starting point and height.
You can set the values with the mouse on a preview exposure. Press the Shift key and the mouse left button to draw the frame.
Click the Set button to send the values to the camera.
Click the Reset button to reset to full frame.