-philip doutreligne -ETX 90 -Orion Atlas mount -70/1300 coronagraph -Kutter catadioptric Schiefspiegler 200/4000 -102/1500 white light solar refractor http://users.telenet.be/philipdo
Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
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:I tend to disagree on this one, Nytecam. I've looked through several coronagraphs in the past, all clearly showing prominences, equipped with 10 A bandpass filters. Using a 0.5 or 0.7 A filter would simply eliminate the need for a coronagraph. They would show the solar disc and the prominences in H-Alpha light, without an occulting cone. I've just ordered a new filter with 1.5 A bandwidth. This should even increase the contrast of the prominences. When the filter arrives, I will report further on the results. I agree on the need for a perfectly tracking mount to keep the sun occulted. When perfectly aligned, most mainstream mounts will do.Kind regards,philip
Quote:Dave,the coronagraph came with four occulting cones of different diameters. I've seen that some amateurs work with only one smaller cone to deflect the sunlight, fitted with different diameter disks. No disks here but different cones instead.
Quote:Dave do you know where to get h-beta
how did you find such a fine instrument as a Hale spectrohelioscope? Any pictures?