Quote:
Originally Posted by astronobob
That is an awesome image Krishan, dig them white storms, grs junior & other details everywhere, , 
Re:
Sorry if a silly question, but is this desciption to do with collimating the SCT, what the purpose of the airy disc in this application & what two screws were turned 1/32 turn ?
Thanx |
Thanks Bob!
Not a silly question, i completely forgot to put why i was examining the airy disk
. Edited first post. For precise collimation you have to examine the in-focus airy disk. The two screws were two of the three screws on the secondary mirror. If you are even slightly off, the in-focus airy disk has an incomplete diffraction ring with a gap pointing to/opposite the screw that needs adjusting. Bad seeing sometimes makes this hard to see. RG610 filter, and metaguide which does live stacking of star images makes it surprisingly easy to get things perfect.