Atk 460 vs 490

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Atk 460 vs 490

Postby David Cejudo » Fri Aug 31, 2018 11:44 am

Hello.

I am finally about to go ahead buying all the equipment.
I will get a Lisa spectrometer to be used with my Meade 12"LX200.
I have some doubts about the camera.
Initially i decided to buy the Atik 460EX with the Sony ICX694 chip, but then i have my doubts if i should get Atik 490EX, with the ICX814.
Both chips are equal in size, but the 694 has pixels of 4,54 in size while the 814 has 3,69.
QE for both seems to be pretty similar, a bit higher for the 694. And the rest of the parameters are very similar.
I guess that read out time will be lower for the 694.

Any advice on those?

Thank you.
David Cejudo.
Observatorio El gallinero.
El berrueco, Madrid.
David Cejudo
 
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Re: Atk 460 vs 490

Postby Olivier GARDE » Fri Aug 31, 2018 3:51 pm

Hi David,

ATIK 460ex is a good choice for the LISA.
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Olivier GARDE
 
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Re: Atk 460 vs 490

Postby Robin Leadbeater » Sat Sep 01, 2018 12:09 pm

I would also say the 460 for the LISA. At 4.6um, the 23um? slit is already well sampled and unless you bin, the 490 will introduce effectively (4.54/3.69)^2 =1.5x more read noise

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