about as practical as an 11 cent coin but it works and image wasnt bad
100mm lens 15 meter focal length ( i ground lens my self). 10 inch mirror (1/16 wave)
no tube -- note ERF placed when in use -- not in pics
what if - h-alpha thru 17th century optics
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Re: what if - h-alpha thru 17th century optics
the "eyepiece" etalon - 60mm objective is eyepiece 20 inch fl , blocking filter
you look thru blocking filter - no "little" eyepiece
you look thru blocking filter - no "little" eyepiece
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Re: what if - h-alpha thru 17th century optics
view - field of view is narrow
but could see proms and surface peach
but could see proms and surface peach
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Re: what if - h-alpha thru 17th century optics
Very impressive John! An interesting configuration
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Re: what if - h-alpha thru 17th century optics
Well done!
A very interesting experiment.....
A very interesting experiment.....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: what if - h-alpha thru 17th century optics
im going to build eyepiece slide table and try this again