Thursday, 14 April 2016
CaK Full Disk with the PGR Chameleon 3 - 10th April
The new PGR Chameleon 3 with it's 3.45um pixels is a great match for the shorter Calcium wavelengths, with the 40mm scope a focal length of some 700mm is ideal to give optial sampling, however to get a full disk in one on the chip like this I need to be running it at around 550mm focal length, which means that the image above is actually slightly under sampled. This has the added benefit that when the seeing isn't ideal the under sampling will worm in my favour to get a cleaner image. It looks good at the scale presented here in the body text, but when right clicked and viewed full size works even better to full effect! Taken with the home brew CaK filter.
Posted by Mark Townley at Thursday, April 14, 2016