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Star Analyser 100 - First Light (Narrow-Field) | by Highlands Astronomical Society
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Star Analyser 100 - First Light (Narrow-Field)

Took some narrow-field spectrographs in the dark sky, before the near full Moon had risen too far and completely washed out the background.

 

Zoomed the lens in to a focal length that ensured the ‘blazed first order’ spectrum (the bright one you can see in the wide-field images) filled about 2/3 the field of view (easy to see through the viewfinder for bright stars like Vega!)

 

Canon 760D with Sigma 70-300mm APO DG lens and Star Analyser 100 diffraction grating.

 

Vega: fl 300mm f/5.6 ISO 3200 3.2s

Mars: fl 300mm f/5.6 ISO 3200 3.2s

Moon: fl 300mm f/5.6 ISO 3200 1/640s

 

Basically processed using PS Express - cropping, black level, contrast, luminance noise.

 

For Vega, you can clearly identify the spectrum Type (‘A’) and some of the absorption lines.

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Uploaded on November 21, 2018