Tuesday, 11 September 2012

CaK western limb 9th September

CaK western limb colour by Mark Townley
CaK western limb colour, a photo by Mark Townley on Flickr.

Tried something completely different on sunday - used the 100mm Tal refractor @ f14 with the homemade CaK filter to do a closeup of todays active regions. This scope seems to perform really well at these wavelengths - will have to use it again!