A method for determining alignment of light and an X-ray fields of an X-ray apparatus, comprising: directing the light field onto an exposure area, positioning a scale and an X-ray indicating element in association with each other at the exposure area such that said scale and X-ray indicating element cross an edge of the light field, wherein said X-ray indicating element emits light upon exposure to X-rays so that parts exposed to X-rays can be distinguished from non-exposed parts, determining a position on the scale where the light field edge is positioned, and directing the X-ray field onto the exposure area. The method comprises generating an image of the scale and the X-ray indicating element using a digital camera, determining a position on the scale where an edge of the X-ray field is positioned, and comparing the scale positions of the edges of the light and X-ray fields.
