Afocal Imaging


This screen allows the computation of Afocal image projection from a telescope thru a secondary eyepiece lens to the camera or CCD. Enter the four Focal Length-F len, Aperture - Dia both in mm, Focal Length of Camera – Fc and or Eyepiece Focal length Fe. Press “Calculate” to figure the parameters Effective Focal Ratio – EFR and the system magnification. Press “Clear” to clear the variables to try new ones.