This is the great orion nebula. 27 40s light images. 30 flats (with max pixel value at 22000 ADU) and 30 bias frames. I think the flats helped a great great deal!!! The lightbox works like a charm and is really easy to use. The LPS has made pollution gradients much more easy to handle, but there is still a local gradient visible. I think that for this target, given the trapezium, I needed to do a lot more light images (maybe 60 or 100) at 20 seconds each and that would have given the SNR that is desired. Also I am wondering if I should use a narrower LPS given the light pollution in my area. Pixinsight was used to do masked stretches and SCNR noise reduction (The image had a distinct green tinge after debayer). Stacking was done using DSS. All said and done, I am pretty pleased with the progress. Hopefully the next time I get a chance, I can correct some of these acquisition issues and come up with a much better image.
Friday, December 19, 2008
Post LPS and Light box
I got my IDAS LPS-P2, mounted it on the hyperstar and started shooting. I also now had the light box for flats. And here's the first attempt:
This is the great orion nebula. 27 40s light images. 30 flats (with max pixel value at 22000 ADU) and 30 bias frames. I think the flats helped a great great deal!!! The lightbox works like a charm and is really easy to use. The LPS has made pollution gradients much more easy to handle, but there is still a local gradient visible. I think that for this target, given the trapezium, I needed to do a lot more light images (maybe 60 or 100) at 20 seconds each and that would have given the SNR that is desired. Also I am wondering if I should use a narrower LPS given the light pollution in my area. Pixinsight was used to do masked stretches and SCNR noise reduction (The image had a distinct green tinge after debayer). Stacking was done using DSS. All said and done, I am pretty pleased with the progress. Hopefully the next time I get a chance, I can correct some of these acquisition issues and come up with a much better image.
This is the great orion nebula. 27 40s light images. 30 flats (with max pixel value at 22000 ADU) and 30 bias frames. I think the flats helped a great great deal!!! The lightbox works like a charm and is really easy to use. The LPS has made pollution gradients much more easy to handle, but there is still a local gradient visible. I think that for this target, given the trapezium, I needed to do a lot more light images (maybe 60 or 100) at 20 seconds each and that would have given the SNR that is desired. Also I am wondering if I should use a narrower LPS given the light pollution in my area. Pixinsight was used to do masked stretches and SCNR noise reduction (The image had a distinct green tinge after debayer). Stacking was done using DSS. All said and done, I am pretty pleased with the progress. Hopefully the next time I get a chance, I can correct some of these acquisition issues and come up with a much better image.
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