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Hi All, I am having an issue in ISIS when I check the Auto Atmosphere box in the General tab. While processing a spectrum with the Auto Atmosphere box checked, ISIS gets as far as “Divide by atmospheric transmission” and then stops with the error message that the atmo file cannot be found. However t...

Thanks a bunch, Andrew. Looking at all of the graphs, the results appear to be very similar to what I found. I was puzzled at these results because I have seen posts from other Atik (314 and 460) users claiming their images are so clean that they do not use darks because their images are very clean ...

I see that the table on this message did not line up. I am trying to scan and attach a file, but my scanner is now giving me fits. More to come.

Hi, I recently purchased an Atik 460ex camera to replace my ST8Xme. In creating a master cosme file in ISIS I was quite surprised at my results and perhaps I am misinterpreting exactly what the cosme file is telling me. The table below shows a comparison of threshold values vs number of pixels above...

Hi Robin, Yes, I do know the purpose of flats as you described. I was just wondering if not using flats in the spectral processing routine would have any adverse effects on the final spectrum. I have actually not detected any, but I certainly could be missing something. I do use an IR curve (nearly ...

Hi Robin, Yes, the IR curve is essentially a straight line. The irregularities occur with or without using the IR curve so apparently they are not caused by any interaction between the IR curve and the flat. I would like to try your suggestion of running ISIS using the XML file from a previous run. ...

Hi Andrew, Yes, I have actually used different flats including the ones I used for each session all with the same results. It does appear as if I am knocking on the door to rectifying this strange behavior, but that door just refuses to open up - at least for now. Your suggestion helped to bring me ...

I may be getting closer to the source of the issue. Andrew, I went through your suggestions and found one I had not tried – the one to retain all images in the processing routine and put them through their paces. Here are the results. No Flat Used: Individual @pro1.fit, @pro2.fit, etc files all good...

Thank you Andrew and Robin for your replies. I agree that I have pretty much narrowed it down to processing. I have attached a zipped file (thanks Robin) containing the 2 images I could not originally upload. Image 1 is the result when the flat is applied. Image 2 is the image when no flat is used. ...

Hi All, i am sorry if this is a repeat post. thought I posted this earlier today but it did not appear in the forum. So I am making a second attempt. I have recently noticed a big change in my BeSS spectra that I am hoping someone can help me solve. A few weeks ago my spectra started having an undul...