... 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...
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...
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...
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...
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...
... 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...
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...
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...
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. ...
... 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...
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...
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...
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...
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...
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...
... 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...
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....
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...
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...
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...
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...
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. ...
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...
... 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...
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....
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....
