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Thanks Ken and Francois.

Francois, I thought that might be the case. To you both: No problem in finding guide stars unless the target is very bright. So, I tied to guide on a bright target in the slit and it worked. Problem solved.

Cheers, Ed

I am thinking about using my Meade Pro/Guiding module only for putting the target in the slit and using my WO 66mm for guiding with my ST402ME. Are there experienced users who use a separate guiding scope? My motivation is to separate putting the target on the slit from finding a suitable guide star ...

Thanks Olivier, that makes it easy.

Ed

Thanks Robin.

Thanks Olivier, Visual spec is my next move.

Thanks, Christian. A question for you: Could this be caused by saturating the calibration image?

Ed

Weather cleared last night. I had to use Rigel as the reference star when (again) 52 Ori yielded images of the wrong size (all other were fine, a mystery). This permitted me to go through the entire process except telluric lines. Some profiles are attached, including my first nebula (low SNR). I am ...

Not much of a session, the wind came up before I could even get a reference star. Olivier's comments on my last post were critical, I now know what the line through the image is and paid attention to exact slit placement. I picked Procyon simply because it was my first alignment star. Very short ...

Hi Robin: You are exactly correct. I made sure and selected full frame tonight and all is OK. I am posting my newest result in another thread.

Thanks, Ed

Strange. My first set of images (last month) were fine. I processed the bias, darks and etc. But now I have this "Uncoherent" message with the batch from last night. I checked my successful ones from last month. They were all size 2,827 KB. The star spectral images last night were 708 KB while the ...

Thanks, Robin. I brought up the flat and measures Ymax at 762 and Ymin at 308. So I will try those values. Now I have another problem and will post it separately.

Ed

For my own benefit I am working on a document summarizing Christian's "How to Make a Masters" document. All is very clear except some options in the flats reduction. I did not find information about three options.

Vertical gain correction
Coordinate Ymax for validity zone
Coordinate Ymin for ...