This medium format swabs are designated for sensor sizes ranging from 3o to 33 mm in width or vertical length of the sensor. Therefore, one has to ignore the horizontal length of the sensor as the swab moves from left to right or vice versa during the cleaning process. Ultra MXD-100 swabs are very popular among DSLR users to clean the coated sensor surfaces to crystal clarity. We recommend using one of the solutions offered by Visibledust to achieve optimum.