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Originally Posted by PhotonCollector
Hi Itchy,
That's a great image of the Eagle Nebula. I really like the wide field. That's a lot of images to take, over 100 ! wow... and unguided too. Could I ask how the image would look if you did not subtract dark frames and did not flat or bias calibration ?
Paul
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Ok Paul, you got me intrigued, so I stacked the converted RAWS without calibration. I was rather suprised with the result. There is a little vignetting but it is not overpowering. The biggest difference was in how much faint detail I was able to extract. It was much harder to get anything out of the uncalibrated stack, and even the fine detail in the brighter parts of the nebula is missing.
Conclusion: Calibration is definitely worth it. What's your (and others) opinion?
The Uncalibrated image is on the left
Cheers