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dual echelle/long slit high/low resolution spectrograph
Posted: Wed May 08, 2019 11:27 pm
by Robin Leadbeater
Does anyone know this spectrograph? It is both high (echelle) and low (long slit) resolution and would match well to a 0.4m telescope with 3 arcsec seeing but it is f20 so needs a large sensor
http://www.spectro-aras.com/forum/viewt ... 296#p12555
Cheers
Robin
Re: dual echelle/long slit high/low resolution spectrograph
Posted: Thu May 09, 2019 10:23 am
by Andrew Smith
At F20 with my seeing I doubt I could get much light into it!
Looks impressive though.
Regards Andrew
Re: dual echelle/long slit high/low resolution spectrograph
Posted: Thu May 09, 2019 10:52 am
by Robin Leadbeater
Hi Andrew
Andrew Smith wrote:At F20 with my seeing I doubt I could get much light into it!
Regards Andrew
Yes I thought that at first but it uses a 120um slit so equivalent to say a 35um slit at f6 so not unreasonable. Presumably there is some reduction in f ratio through the optics, though it still needs a large sensor. (They suggest the KAF 8300 but I think that has a rather poor QE. The low cost large CMOS sensors around now might be better perhaps?)
Cheers
Robin