I am just about recovering from my second bout with the Covid virus so I thought I would do something vaguely astronomical which wasn't cloud dependant. We have had a lot of clouds in Lowestoft recently. I discovered a nearly completed low resolution transmission spectrometer with fixed slit in the shed which I was building some time ago for obtaining the spectrum of extended objects. Sounds very technical but as per my norm, very Valerie Singleton and Chad Valley.
Anyway somewhere in the
The weather continues to be very unfavorable for astronomy, so I continue to play in my 'shed of delights'. I have addressed some of the issues associated with using a 500 line diffraction grating as a simple filter cell. I did not want to permanently adapt my QHY5-11 camera for spectroscopy and so designed a 3d printed block to allow it to be brought very close to the imaging chip at the optimum angle for a first order spectrum at 550nm. This appears to have minimised 'fish tailing' of the spe
This has been a long time in gestation - first I built the 3d printer from a kit my son gave me for Christmas 2018, then I had to pluck up the courage to turn it on. The whirring and flashing lights are all a bit much for a man more accustomed to using Crayola 'chubby' crayons than digital vernier calipers. Then I had to get my head round Sketch-Up, Netfabb, Repetier Host , Slicer3 and how to stop molten filament from blocking up a very small hole in a very hot bit of metal.
In my shed I