Hawksmoor

Could not increase the signal to noise ratio significantly using my redundant QHY5v planetary camera as a spectrometer so decided to use it as a guide camera freeing up my QHY-11c for acquiring very low res spectra and blurry images of planets. Some fiddling about later managed to obtain a spectrum for Sirius. Best thing being, I managed this without venturing out into the cold. South facing living room, open the patio door, point tripod mounted Altair Astro 66mm Doublet with Spectrometer Mark 3 attached and job done. Quite a lot more fiddling required to get grating and imaging chip better aligned but in principle it appears to work. Also used a new black and white laser printer to print an objective grating on acetate sheet for my 5 inch refractor. Thought it would be interesting to compare spectra produced using converging and non-converging arrangements on the same scope. 

Now off to bed so night-night stargazers.