Bad efficiency of the eShel from shelyak
-
- Posts: 35
- Joined: Thu Apr 21, 2016 8:15 pm
Re: Bad efficiency of the eShel from shelyak
I am not at all happy about this, I would prefer to go on with ISIS since Midas is not so easy to use.........but at the moment I have no choice!
-
- Posts: 1244
- Joined: Thu Sep 29, 2011 6:35 am
- Location: Rhône Alpes FRANCE
- Contact:
Re: Bad efficiency of the eShel from shelyak
Hi Berthold,
In the screenshot of the ISIS main page, you checked:
- Sum before
- Median Filter
- Function de blaze lissé
When I process my eshel spectra (with an ATIK 460ex CCD), I check only :
- Optimal Binning
- Cosmic Rays filters
Do you use a CMOS camera ?
Christian wrote a page that explains the checkboxes
http://www.astrosurf.com/buil/isis/eshe ... index.html
In the screenshot of the ISIS main page, you checked:
- Sum before
- Median Filter
- Function de blaze lissé
When I process my eshel spectra (with an ATIK 460ex CCD), I check only :
- Optimal Binning
- Cosmic Rays filters
Do you use a CMOS camera ?
Christian wrote a page that explains the checkboxes
http://www.astrosurf.com/buil/isis/eshe ... index.html
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
-
- Posts: 35
- Joined: Thu Apr 21, 2016 8:15 pm
-
- Posts: 439
- Joined: Sun Jan 24, 2016 7:14 am
Re: Bad efficiency of the eShel from shelyak
To: Berthold,
Christian gave a lot of great advice.....I don't have an eShel myself (as mentioned earlier) but I notice you have a Kaf3200 sensor which may not be optimal for
the eShel. I used this same sensor for my old L-200, and I got a ripple effect; abiet without using flats which were not part of that device, unlike Alpy600, LISA,
or LhiresIII. Since I acquired the Atik line of cameras for my Shelyak line of spectroscopes, this problem has gone away; sold my old L-200 last year.
Christian wrote this article on thew advantages using the Atik460ex with eShel: http://www.astrosurf.com/buil/eshel4/eval_en.htm
James
Christian gave a lot of great advice.....I don't have an eShel myself (as mentioned earlier) but I notice you have a Kaf3200 sensor which may not be optimal for
the eShel. I used this same sensor for my old L-200, and I got a ripple effect; abiet without using flats which were not part of that device, unlike Alpy600, LISA,
or LhiresIII. Since I acquired the Atik line of cameras for my Shelyak line of spectroscopes, this problem has gone away; sold my old L-200 last year.
Christian wrote this article on thew advantages using the Atik460ex with eShel: http://www.astrosurf.com/buil/eshel4/eval_en.htm
James
James Foster
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
-
- Posts: 1431
- Joined: Mon Sep 26, 2011 6:59 pm
- Contact:
Re: Bad efficiency of the eShel from shelyak
Hi Berthold,
Unselect the option "Median filter" and compare. The problem is here, I suspect.
The median filtering option is only for very well sampled spectral (typically eShel spectra taken by using small pixels CMOS camera).
Christian
Unselect the option "Median filter" and compare. The problem is here, I suspect.
The median filtering option is only for very well sampled spectral (typically eShel spectra taken by using small pixels CMOS camera).
Christian
-
- Posts: 35
- Joined: Thu Apr 21, 2016 8:15 pm
Re: Bad efficiency of the eShel from shelyak
berthold
-
- Posts: 1040
- Joined: Mon Aug 31, 2015 11:26 am
Re: Bad efficiency of the eShel from shelyak
Possible "cosmic rays filter" if the spectr is very short ?
-
- Posts: 35
- Joined: Thu Apr 21, 2016 8:15 pm
Re: Bad efficiency of the eShel from shelyak
Hello,
I have had an ATIK 460ex to avoid those ripples. No effect. The same probleme was to see as demonstrated with the 460ex! That is not caused by the detector! Please see the results with MIDAS!
berthold
I have had an ATIK 460ex to avoid those ripples. No effect. The same probleme was to see as demonstrated with the 460ex! That is not caused by the detector! Please see the results with MIDAS!
berthold
-
- Posts: 35
- Joined: Thu Apr 21, 2016 8:15 pm
Re: Bad efficiency of the eShel from shelyak
there must be a problem with ISIS
unfortunately I can't send *.xml
that's not a probleme of the hardware.
berthold
-
- Posts: 35
- Joined: Thu Apr 21, 2016 8:15 pm
Re: Bad efficiency of the eShel from shelyak
Hi,
I overlooked the message of Christian, I don’t know why. Please excuse me.
Martin Dubs pointed this out to me once more, not to use the “median filtering” .What I don’t understand: I used at time CMOS detectors, but it was the same.
Berthold
I overlooked the message of Christian, I don’t know why. Please excuse me.
Martin Dubs pointed this out to me once more, not to use the “median filtering” .What I don’t understand: I used at time CMOS detectors, but it was the same.
Berthold