scary page on focal reducers

Forums Spectroscopy Focal reducers for Alpy! scary page on focal reducers

Robin Leadbeater

Since we are near Halloween, have a look at these pages concerning focal reducers on Christian Buil’s site.

The first one describes precautions to be taken with focusing using a focal reducer with a LISA but the second one, looking at the effects of the  interraction between chromatic aberrations and atmospheric dispersion is particularly frightening !