Jimmy Celestron 1100 CPC f/10 SCT Celestron 150mm f/8 Refractor on CG-5 mount Celestron 130mm f/5 Newtonian on Lxd55 mount Orion 120mm f/5 Refractor Meade 80mm f/11 Refractor Orion Short Tube 80mm f/5 Refractor Lunt 60mm double stack on IOptron Coronado PST double stack on IOptron mount Mallincam Xtreme, Mallincam SSI, Samsung 2000, Celestron Skyris & Meade DSI II color cameras
Skywatcher 6 inch F-5 Newtonian,Lunt LS60THa,Orion ED80T CF ED Triplet,Vintage C-8(1983),Celestron 8se, Celestron CG-5,iEq45, Atik 314L+Mono,Atik 314 L+ OSC, Imaging Source DMk 41AUO2 My images viewed here.. http://www.astrobin.com/users/northisup2/
Quote:To me, the stars are larger than they should be but overall, I am pleased with the results that I get on good seeing nights.
Quote:Here is an image of the Trifid Nebulae taken a few nights ago. No processing but I did have to reduce the size in order to post here. Jim
Nytecam 51N 0.1W Meade 30cm LX200 astrograph+C8+Ha+CaK PSTs+spectrographs SX M9+Lodestar-C+M CCDs/Canon 1100D DSLR My Meade astrograph-colour deepsky My supernova discovery My dome build/spectroscopes/DSO images/Lodestar colour images & videos
Quote:CCDs have an almost unlimited IR range sensitivity?Hardly. I use an 80mm f/5 achromat and C8, both with focal reducers. The refractive optics in both cases do not result in any undue star bloat with my Mallincam, and I don't use any kind of IR block filter. From what I can see, folks are unduly afraid of this potential phenomenon, and in their minds blow it out of proportion.
Quote:It would be instructive to see comparison images taken with an instrument having poor near-IR focusing, with and without an IR blocking filter. So far I haven't found the need for one, and so don't have one on hand to test. It would be best, if possible, to differentiate between IR and deep blue bloating of stars, as it's the beyond-visual, extended red sensitivity which is of interest...