dual echelle/long slit high/low resolution spectrograph

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Robin Leadbeater
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dual echelle/long slit high/low resolution spectrograph

Post 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
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Andrew Smith
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Joined: Fri Sep 30, 2011 12:23 pm

Re: dual echelle/long slit high/low resolution spectrograph

Post by Andrew Smith »

At F20 with my seeing I doubt I could get much light into it!
Looks impressive though.
Regards Andrew
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
Contact:

Re: dual echelle/long slit high/low resolution spectrograph

Post 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
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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