Hartmann mask template generator for Astronomy & Astrophotography
In astrophotography, there is always difficulty in seeing well enough
through the camera's view screen to know if the image is properly focussed.
An easy solution to this is the Hartmann or Scheiner mask (click here
The following form yields a PDF template of a Hartmann mask. This template can then be used to cut out a Hartmann mask for your
telescope for focusing purposes.