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After finishing the modified LowSpec3 I quickly took this spectrum and calibration frame.
These are raw frames with no geometric correction, dark, bias or flat. No ‘scope was connected to the spectrograph – just a flooded 30um slit. The calibration frames were 5 sec “Relco” exposures.
I used a 600 l/mm grating for which the larger camera lens produces excellent focus across the visible range.
Resolution is around 1,800 at Ha with the Na lines easily split. Not shown here but coverage into the IR easily captures the 9122A line with a hint of the 9657A line. Further investigation asap.
I’ve over-exposed to capture the fainter lines so some brighter lines will appear blurred.
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Hi Tony, I’m sure you won’t remember me but you kindly showed me your LowSpec at the BAA Winchester weekend in April last year after your presentation. Thus inspired I’ve finally taken delivery of a Wanhao Duplicator I3 Plus printer and have been exploring the details of the LowSpec 3 on Thingiverse. I’m trying to verify that I can readily source all of the optical parts and the hardware. I see there is a micrometer incorporated into the design but am struggling to find a suitable device. Can you let me know details please? Also, what printer filament have you found most suitable? Thanks, Chris.
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