Sylvain Weiller, well known for his excellent images with the PST, has fitted his PST with a x1.5 photographic converter, which he claims has increased the focal length from 400mm to 600mm and gives better definition and resolution.
Interesting!!!
http://sweiller.free.fr/PST/indexPST.html
Note: the front thread of the PST is a 52mm thread.
Improvements to your PST!
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Merlin66
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Improvements to your PST!
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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