Cameras are not widely used nowadays for x-ray diffraction studies since they involve photographic films and processing, which is time consuming; they also require the storage and disposal of chemicals. Additionally, film storage can be a problem when many analyses have been performed. We have included for completeness the method used for precise lattice parameter determination with a Debye-Scherrer camera, and at the end of this module you will find an exercise using this method. However, it is unlikely that you will encounter this method in practice.