The scanning of the solar disk using a Sol'Ex can be calculated using following formula
T = 8.79 * P / (f * v * Cos (delta))- T = exposure time in s
- P = pixelsize in micron; include binning
- f = focal point of telescope in mm
- v = scanning time of telescoop, typical 4, 8, 16
- delta = declination of the sun
It looks like that the outcome of the exposure time compared with the scanning time is rather exponential.