You can choose the Specify focal length option if you wish to run in interactive mode and try out different focal lengths, even with a camera attached. If there is a zoom lens attached to the camera, you will see the distance for both the Wide and Telephoto ends of the range.
With a camera connected, the Get focal length from attached camera will be automatically selected when the tool is opened and the bottom of the window will display the appropriate distance for testing with the attached lens. In the example above, for a focal length of 24mm, we require a minimum target distance of 1.2m. Moving this slider will update the minimum target distance displayed at the bottom of the window. With no camera connected, you can choose any focal length using the slider (next to the Specify focal length text). The Target Distance Tool operates in 2 modes. FoCal’s interactive Target Distance Tool lets you check the required distance for calibration quickly and easily.Ĭhoose Tools > Target Distance Tool from the main FoCal window, or hit CTRL+G to open the Target Distance Tool.
Having the right distance between the camera and the FoCal Calibration Target is important in getting accurate and useful calibration results.
