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Hi all, in the last few nights I have tested the new technique of gradient modeling and removal by Vicent Peris (https://www.pixinsight.com/tutorials/multiscale-gradient-correction/). In my opinon works very well. in my two latest images you can see the results.   In M101 you can also see a comparison between before and after the correction. |
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| Nice, thanks! |
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Hi, went back and read the technique, looks like you need to have a second image that overlaps the first... a bit too much for me without an operational second camera... but I have been thinking of adding one of the newer CMOS cameras atop my main telescope for wide angle... maybe this is an excuse. I have the same gradients you have and maybe will post them when I put up M 53, which I am working on today while house-bound. |
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looks like you need to have a second image that overlaps the first… That's right: you need a secon wide field image to use as a reference for the primary. As a secondary camera I'm using a Canon 60D with a 180 mm telephoto lens by Leitz (an Elamerit-R 180 f/2.8 ). I control the camera only with the intervallometer. |
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Hi, went back and read the technique, looks like you need to have a second image that overlaps the first... a bit too much for me without an operational second camera... Just for your reference, I tried this technique with a reference taken from the web (aka not mine) and worked surprisingly well… I must do an in deep analisys, but seems that it is not mandatory to gather your own data to apply this technique. |
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Thanks for pointing to this tutorial. With an additional wide-field imager, or indeed an on-line image source, it looks very useful for LRGB images. However, I fear that for narrow-band it could be a bit more tricky. Self-captured wide-field images could be possible with 2 sets of narrow band filters with the same passbands, but on-line sources are more difficult as we need access to the individual channels to make sure that the channel combination is the same. cheers, Richard |
