| This interactive digital single-lens reflex (DSLR) calculator will show a telescope's field of view with popular camera bodies and accessories. Enter the 'scope's aperture in inches or millimetres (be sure to select the correct units!), its focal length in millimetres and the DSLR sensor-type (manufacturers use sensors of differing sizes). If you use a Barlow lens or focal reducer, commonly encountered values may be selected from the pull-down menus. |