Thursday, 28 August 2014

AR12150 & AR12515 In CaK Light 27th August

The seeing conditions were being remarkably obliging first thing wednesday morning; the air was cool and clear and feeling remarkably autumnal for an august morning.  This stillness and clarity was great for CaK observing, and, as a result I was able to up the focal length up to 2250mm on the 80mm setup, giving me near f28.  I could have probably got away with running at 100mm aperture for this, but want to do more work on the ERF on this configuration to get more light throughput.  Reflection and ghosting issues seem to be all dealt with now with the homebrew CaK filter, but as always there is always room for improvement.  The camera used was the imaging source DMK31.