I have a feture request however I am betting this is actually already coverd by astap and I just do not know much abou it yet.
If we are stack images taken with slightly different focal lenths. Say 522mm vs 511mm can ASTAP scale or stretch an image to fit the other? I have two identical scopes in FL but naturally they do not actually have exactly the same FL. Be nice to combine data from each.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
If I remember well combining of images made by different focal length will work but it is never really tested due to lack of test images. But note ASTAP will not make the pixels larger so suffient coverage will depend on the number of images stacked.
If you have two test series, it will be interesting to test and maybe I can improve the combining.
Last edit: han.k 2021-12-16
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Adapting to different FOV scale is no problem up to 20 or 30 % difference. To get a good pixel coverage propably the best approach is to use the image with smallest FOV as reference. It will be interesting to see how it performs once you have the series.
Han
Last edit: han.k 2021-12-18
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
How do I select the Key image? Is it that crown that shows up? Thing is when the crown shows up it wil not stack becase of some error. Shame as its usualy best image in the quality scale.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Yes the crown is indicating the reference image. This is the image of the highest quality.
That should also work best but I noticed that in some cases loss of tracking could result in low HFD's and then this image could be in rare cases selected as reference image. So in case of problems I check the reference image. Then it turns out it is bad. Up to now I never had the requirement to select an other reference image.
There is no possibility to select a reference image. There has been no need either.
Han
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
To fallow up with this image scale thing. I ASTAP is doing what it is suposed to be doing. Granted my focla lenth according to plate solving changes only a few mm. Some of the aberations distort around some stars but the center of the star looks aligned cocrectly. Here is the image I just did. I was using Star alignment. The two focal lenths were 522 and 518mm
I have a feture request however I am betting this is actually already coverd by astap and I just do not know much abou it yet.
If we are stack images taken with slightly different focal lenths. Say 522mm vs 511mm can ASTAP scale or stretch an image to fit the other? I have two identical scopes in FL but naturally they do not actually have exactly the same FL. Be nice to combine data from each.
If I remember well combining of images made by different focal length will work but it is never really tested due to lack of test images. But note ASTAP will not make the pixels larger so suffient coverage will depend on the number of images stacked.
If you have two test series, it will be interesting to test and maybe I can improve the combining.
Last edit: han.k 2021-12-16
I think I will soon. The two socpes are very close togehter. Ill collect some data and get it to you.
Adapting to different FOV scale is no problem up to 20 or 30 % difference. To get a good pixel coverage propably the best approach is to use the image with smallest FOV as reference. It will be interesting to see how it performs once you have the series.
Han
Last edit: han.k 2021-12-18
How do I select the Key image? Is it that crown that shows up? Thing is when the crown shows up it wil not stack becase of some error. Shame as its usualy best image in the quality scale.
Yes the crown is indicating the reference image. This is the image of the highest quality.
That should also work best but I noticed that in some cases loss of tracking could result in low HFD's and then this image could be in rare cases selected as reference image. So in case of problems I check the reference image. Then it turns out it is bad. Up to now I never had the requirement to select an other reference image.
There is no possibility to select a reference image. There has been no need either.
Han
To fallow up with this image scale thing. I ASTAP is doing what it is suposed to be doing. Granted my focla lenth according to plate solving changes only a few mm. Some of the aberations distort around some stars but the center of the star looks aligned cocrectly. Here is the image I just did. I was using Star alignment. The two focal lenths were 522 and 518mm