Quote:
Originally Posted by Terry B
I had the same problem with saving the response curve. The .spc files will only save 4 graphs.
I display the camera response curve that you want to save and then rename it as the 2nd reference graph. There is a way to do this in the "edit" menu. (I will look up the correct button when I get home as I don't have the program here at work.)
The other option is to save the response curve as a .dat file.
You can then open up the file you want to calibrate as well as the response curve and using the "divide" function correct the unknown graph.
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Thanks, Mark! Sounds exactly like what I've been missing.
I'll have a play.
Quote:
Originally Posted by Heian
Terry / Al,
the attached pdf, (hope you can read it OK) were instructions given to me by Robin Leadbetter on how to process spectra, and get a camera response curve. It may be going over old ground, but I thought it may help. Certainly helped me! 
Another comment from Robin was on the use of a focal reducer to improve the image. The aim was to get the smallest size zero order image, (basically increase FOV) and prevent significant focus shift and also smearing across the spectra. I've been using a 120mm f8 refractor and I get far better spectra when I use a 0.6x reducer and drop it to f5.
The exposure times are virtually unaffected.
cheers
Mark |
Thanks for the document, I've had a read - just the right mix of stuff I knew and stuff I didn't.
Thanks!
Some interesting stuff in there about losing detail in the blue... maybe I'll have to play about with my FR again, etc (I haven't been using it, but the seeing might be destroying all detail in the short wavelengths.
Al.