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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 1985
Loc: Hockessin, De
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Re: what's up with SHS yahoo group?
07/01/09 02:25 PM Attachment (7 downloads)
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Brian Manning made a nice one using a 3" f/15 refractor and my unit which I'm working on now is similar in design. It uses 70mm Celestron refractor.
http://adsabs.harvard.edu/full/1982JBAA...92..112M
There was one build by a high school student written up in Sky and Telescope in the 70's made from two 50mm bino-objectives and inexpensive transmission grating but you really don't want to go smaller then around a 45" fl for the spectroscope section or the width the spectral line is narrower and that requires a narrow slit openning.
For a spectroheliograph used with a webcam, the spectroscope section can be very small. An achromat with about 7" focal length and a 2400 lpm grating would work very well and teamed with a 60mm to 80mm refractor would make for super imaging system.
- Dave
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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4.5" f/16 Schupmann Medial refractor, 14 Stellafane awards 7 in optics
Engineering = Taking what you have and making what you need.
Edited by DAVIDG (07/02/09 11:11 AM)
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