High resolution spectrum of whole Sun near main hydrogen line in Sol’Ex 10/6/2024
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Sky was too cloudy today to attempt my first solar scan and processing of image of Sun in INTI – so instead I pointed my Sol’Ex spectroheliograph (SHG) at the…
How to focus main telescope Sol’Ex is attached to 8/6/2024
I am indebted to Minh for advice in attached thread on how to achieve focus – not as easy as when using eyepiece! Andy
New attempt at focusing Sol’Ex collimation tube – focus point achieved with ZWO ASI 174MM camera 8/6/2024
New photos of Sol’Ex aluminium collimator tube and Shelyak collimator lens, ZWO helical focuser and ZWO ASI 174 MM camera showing position of camera which is mounted via 1.25 inch…
Minh’s advice on sorting out focusing issues with collimator tube on my Sol’Ex spectroheliograph 7/6/2024
Thanks Minh for this advice! Andy
Observatory at LRO gets a coat of creosote
Time to protect the wood! The observatory is 8-10 years old now. I’ve replaced the roof at one point from the original felt to shingles. Regular creosote seems to have…
Correctly focusing Sol’Ex camera tube at night 6/6/24
Correctly focusing Sol’Ex camera tube by taking it out of Sol’Ex, mounting on tripod, and aiming at star at night. This needs an object that is close to infinity and…
30 sec dark frame Sol’Ex with ASI174MM camera 5/6/2024
Nice and dark with very few bright pixels – shows no light leak on Sol’Ex – great stuff! Andy
Optimal focus position on focuser on camera tube on Sol’Ex 5/6/2024
I am finding this very difficult to ascertain – using Christian Buil’s advice, the setting is 2.62mm on the ZWO helical focuser BUT I seem to have sharper image of…
Key PDF documents from Christian Buil’s website on building and using Sol’Ex Spectroheliograph, accessed 5/6/2024
Note Christian Buil’s website & Youtube have many more excellent tutorials and information on Sol’Ex – these three are summary PDFs for quick access. Constructing Sol’Ex: http://astronomy.me.uk/wp-content/uploads/2024/06/How-to-construct-SolEx-Montage_solex_EN-reduced-size.pdf Adjusting Sol’Ex after…
Incredible effect of focusing collimator block on sharpness & visibllity spectral lines Sol’Ex 5/6/2024
Slight focusing movements only required – amazing effect! Andy