Thanks for all your comments.. I'll look at getting one of the gratings through Optometrics. regards Mark ... manufactured...
936
Olivier Thizy
olivier_thizy
Nov 13, 2007 1:49 pm
Dieter, As a reminder, note that VisualSpec has a forum where question can be asked (and hopefully answered!). You can also browse through previous questions....
935
ssb73q
Nov 13, 2007 1:26 pm
Hi Robin, I found your link to Optometrics very interesting. The grating curves they show are identical to the gratings offered by Thorlabs, just lower cost....
934
cometcloud2001
Nov 13, 2007 12:51 pm
... does ... Amongst my bookmarks for diffraction grating sources I have Knight Optical UK Iin Kent ).They look to have swome useful optical kit. I have not...
933
staranalyser
Nov 13, 2007 12:13 pm
Hi Mark, There are a few manufacturers listed in the ARAS bookmarks but I can't vouch for them. http://www.astrosurf.com/aras/bookspec.htm Interestingly the...
932
jwarnerr
Nov 13, 2007 5:08 am
... Very nice Robin. Nice configuration for an easy capture. I use this config. all the time for visual work using 2" eyepieces. Jerry...
931
staranalyser
Nov 12, 2007 4:58 pm
Hi all, This comet is too big to record a spectrum without using a slit so I tried a slightly improved version of my old eyepiece projection plus slit setup. ...
930
ssb73q
Nov 12, 2007 1:17 pm
Hi Robin, the other issue for bandpass range is the spectral response of the CCD chip. Considering the typical amateur system (optics and cameras), I think...
929
staranalyser
Nov 10, 2007 4:41 pm
Hi Wofgang, ... I understand it is just a single layer MgF2 coating optimised for visual wavelengths. Not the most efficient but in the band we are interested...
928
Wolfgang Renz
aavso_rwg
Nov 10, 2007 1:10 pm
Hello Maurice Yes, the Paton is ~ 100 lp/mm and the Rainbow and the Baader ~ 200 lp/mm. But no, they should not really look the same not. They should be easily...
927
nytecam
Nov 10, 2007 8:28 am
Welcome Dieter, I've a Baader transmission filter on loan and just eyeballing it find it essentially identical to my Rainbow Optics rating in dispersion [same...
926
jwarnerr
Nov 10, 2007 7:15 am
... Thanks Dieter and presume you read the other group to see new info there tonight also - Jerry ... comment' as ... just...
925
Dieter
dieterkuespert
Nov 9, 2007 10:38 am
Hi Jerry, many thanks for the information. Well at least I got the 'No comment' as a reply from Baader. Some other suppliers are similar about their products....
924
jwarnerr
Nov 9, 2007 7:28 am
... Hi Dieter & welcomen. I have since seen your posts to the other group also. So there is only one USA grating in same class to compare as you asked the...
923
Mark Dawes
mrk_dws
Nov 9, 2007 4:21 am
Hi all, I've been fiddling around with some old lens and I'l like to see if I can put a Littrow spectroscope together. Apart from Edmund Optics, does anyone...
922
dieterkuespert
Nov 8, 2007 6:54 pm
Hi Robin, many thanks for the information. In the German Manual Baader gives the following efficiency values: nm Baader % US sample % 425 80 ..........65 450...
921
Jacques Savard
suppjos
Nov 7, 2007 7:47 pm
is this http://tubecollector.org/cv271.htm can be used for calibration or not possible also this xenon fill http://www.tubecollector.org/3b28.htm or this one...
920
staranalyser
Nov 7, 2007 4:18 pm
Hi Dieter, Welcome to the group, I made some very rough measurements of the spectral response of the SA last year based on the instrumental response of my...
919
dieterkuespert
Nov 7, 2007 12:41 pm
Hi All, I'm new to the group. I got here by advice of Jacques Savard. I am actually starting in spectroscopy now with a Baader Blazed Grating and I was...
918
janet simpson
janet627821
Nov 6, 2007 1:50 pm
... Hi Steve, Thanks, I also have been burning the midnight oil, but have to take a break for a bit to catch up with other things ;^( . Just hope I don't...
917
Steve
ashleyparkuk
Nov 4, 2007 7:38 pm
Hi Robin, ... Hi Janet I can echo what Robin said about Vspec. I have been on quite a learning curve with it, mainly with correcting for the camera response. ...
916
janet simpson
janet627821
Nov 3, 2007 11:53 pm
Hi Robin, Thank you for your help and advise. I will carry on working on it and try to get through the minefield. However will have to take a break for a while...
915
staranalyser
Nov 2, 2007 4:08 pm
Hi Janet, I find using Vspec a bit like walking through a minefield. It takes time to find a safe path through it. Once you find that path you are usually ok...
914
jwarnerr
Nov 2, 2007 4:18 am
... Janet I think you are doing very well. I very much liked your original image - it showed care. Thanks. Jerry ... very good of you to go to so much trouble...
913
janet simpson
janet627821
Nov 2, 2007 3:25 am
Hello Robin and Jerry, I went back to Vega and worked out I had been unable to seperate the raw image of Merfak because I forgot I had to save it before it...
912
janet simpson
janet627821
Nov 1, 2007 11:36 pm
Hi Robin, Thank you very much for trying it for me. Janet To: staranalyser@...: staranalyser@...: Thu, 1 Nov 2007 23:18:47...
911
staranalyser
Nov 1, 2007 11:18 pm
Hi Janet, I also tried the same thing on your original image, calibrating it using Mirfak H Beta. The resulting coma/core division, smoothed, normalised and...
910
janet simpson
janet627821
Nov 1, 2007 11:18 pm
Hello Jerry and Robin, Thank you very much for your advise re the Mirfak spectrum. It was very good of you to go to so much trouble to investigate the dark...
909
janet simpson
janet627821
Nov 1, 2007 6:32 pm
Hi Robin, Thank you. I have uploaded the result from dividing the coma spectrum by the core. I could not use the option 'normalize and replace' because it...
908
jwarnerr
Nov 1, 2007 7:01 am
... I like your spectrum. Good work. I also puzzled over the dark line feature since seeing it. Like Robin my first instinct was dust or dirt but if so then...
