Posted by Alex Storrs on June 21, 1999 at 14:53:53:
In Reply to: On the value of Ramp Filters posted by John Hutchings on June 17, 1999 at 15:04:26:
I too would like to put in a plug for the ramp filters. These can be used in planetary observations for which the frequency of use would be too low to justify a dedicated filter. LRFs have been used in the past for monitoring Mars, for distinguishing silicate mineralogies there and on other rocky bodies, for atmospheric studies (esp. across terrestrial absorption bands), and for icy surfaces (ozone comes to mind). These would be especially useful if they could be put in or near a focal plane, preferably after correction for spherical aberration.