These may be of interest to someone considering a cleostat/ heliostat/ siderostat.
Polished flat to better than 1/8 wave, aluminium coated from a substrate of 25mm BK7.
Available ex-Europe.
Any interest let me know.
Any interest in two 150mm diameter 1/8 wave optical flats?
- Merlin66
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Any interest in two 150mm diameter 1/8 wave optical flats?
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer