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Like I expected then, this sphere is then the result of very little or no movement between the light frames. For distortion correction to work you would need more dithering between the frames.

If the registration RMS is low (< than 0.3 pixel give or take) without using distortion correction then things are fine, otherwise I’ll need to have a…[Read more]

I was just typing my previous message when you replied. So yes, I can confirm it happens after enabling dynamic distortion correction. I’ll send you the data set so you can test it.

This sphere issue occurs after enabling “use dynamic distortion correction”. I’ll check what happens with the next set of data (3rd panel of the mosaic).

Okay, the sphere most likely is the result of using distortion correction in a case where it’s actually not needed.

What registration settings did you use? Try registering without distortion correction and/or switching the “same camera and optics”select box.

Would love to test this myself @mauricetoet, so I can check  in which algorithm this…[Read more]

Hi @mauricetoet, I think you could be right that the removal of the reference is the problem. I’ll see if I can replicate and solve this. Thanks 😉

APP would automatically need to select a reference for registration in this case, at the start of registration.

1) great

2) no just the other way round actually 😉

“So if I understand correctly I should load a Master BIAS when I create the Master DARK’s”

No, preferably not 😉 if you are going to use darks, it’s best to not use a master bias. So don’t load the master bias when you create the master dark. And don’t load the master bias when you calibrate th…[Read more]

1) Indeed, so far vignetting hasn’t been a problem when I applied the flats!

2 & 3) So if I understand correctly I should load a Master BIAS when I create the Master DARK’s. And I should not load a Master BIAS when I create the Master FLAT’s, right?

Thank you @mauricetoet, yes, I feel the same way. Using the l-calibrated image viewer option immediately tells you if calibration is working correctly. I always check it before I continue to star analysis.

On the other hand, while creating the master frames, it will be most helpfull to give warnings to the user if they follow a calibration…[Read more]

Hoi @musquetier,

Your multi-channel workflow is correct I would think, although, I have 3 remarks:

1) when you have applied flats, the correct vignetting step is not needed, since you should have corrected the vignetting of your data with the flats 😉 So the correct vignetting function is only needed when the user doesn’t have adequate flats at…[Read more]

I think something similar has happen to me in the past (master FLAT not applied whileI was under the impression it was); e.g. see issue reported in the first posting in the thread https://www.starry-night.nl/forums/topic/m3-bolhoop.

So do I got it right when I follow the following flow for mono-subs using color filters?

1) Create master BIAS…[Read more]

” But it will prevent a lot of DSLR users, who did it in the wrong way, from processing old data right?”

No completely wrong I am afraid…

Calibrating old data is perfectly fine and possible in APP, why wouldn’t it be?

I am even calibrating old data from 2013 from Scott, @srosenfraz, which was sub-optimal calibrated with Images Plus. (Scott…[Read more]