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Alpy 600 vs LOWSPEC 3.0


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ALPY is fixed resolution at ~12 Angstrom. (Except for my modified supernova classifier version 🙂 ) .  You can vary the dispersion/resolution of the Lowspec by changing gratings and slit width. There is a lot more to a spectrograph than this though.  For example the ALPY is designed to operate down to f4 whereas the Lowspec has severe chromatism at low f ratios due  to the simpler off the shelf optics which means the  spectrum goes out of focus at the blue and red end.  To avoid this you need to run a higher focal ratio which means a wider slit and a higher dispersion for the same resolution. The ALPY is also extremely stable both with regards to temperature and flexure and so once set can be run without any intervention, good for remote operation. Of course you also need to produce the parts and assemble them with the Lowspec. (A commercially produced Lowspec would likely be more expensive than the ALPY, similar to what happened with the LHIRES which was originally a not for profit kit ) Theclosest commerical comparison with the Lowspec is probably the Shelyak LHIRES or Baader DADOS

Cheers

Robin

Edited by robin_astro
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