1. A method for operating an x-ray image recording device having a moveable x-ray C-arm, comprising: receiving a user input for moving the x-ray C-arm into a predetermined position by the x-ray image recording device; moving the x-ray C-arm into the predetermined position, the x-ray C-arm supporting an x-ray source and an x-ray detector, and the x-ray detector being moveable opposite to the x-ray C-arm for changing a distance from the x-ray source; determining a variable at a relative position between the x-ray source and the x-ray detector in the predetermined position, the variable specifying an image quality of an x-ray image to be obtained by the x-ray image recording device in the predetermined position and/or specifying an exposure dose of an operating person when recording the x-ray image; and taking a measurement for effecting a movement of the x-ray detector by the x-ray image recording device based on the variable.