ASI2600MC combined with QHY268M

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Georg N. Nyman avatar
Hi everyone,
I have the following question:

The ASi2600MC delivers 6248x4176pixel subs, the QHY268M 6252x4176subs. I would like to use the ASI OSC to get subs for stars in RGB and combine that stack with my Ha, OIII, S2 subs from my QHY258M - but: There is a difference of 4 pixels horizontally between the two cameras.
How to do it? What would you suggest?
My idea would be to stack and process Ha, OIII and S2 from the QHY, stack the RGB from ASI and crop the horizontal axis of the QHY from 6252 to 6248 and after it, align the RGB with the QHY stack. Is this the correct approach?

Thanks and CS,
Georg

PS: I assume that there is nobody in our community who wants to swap the ASI2600MC (with M48 and M54 adapter) for a QHY 268C, right?
matthew.maclean avatar
The pixel size is the same (3.76micron) because the underlying sensor (IMX571) is the same, so your physical field-of-view per pixel should be the same in both cameras (assuming you've used them with the same telescope). The difference of the four pixels in the exported images from the camera shouldn't matter since you will certainly have at least that many pixels of alignment artifacts in stacking and aligning the two data sets anyway; I think you could just crop the composite image at the end to eliminate any artifacts along the edges and that should work fine.
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astrodawg avatar
Georg N. Nyman:
Hi everyone,
I have the following question:

The ASi2600MC delivers 6248x4176pixel subs, the QHY268M 6252x4176subs. I would like to use the ASI OSC to get subs for stars in RGB and combine that stack with my Ha, OIII, S2 subs from my QHY258M - but: There is a difference of 4 pixels horizontally between the two cameras.
How to do it? What would you suggest?
My idea would be to stack and process Ha, OIII and S2 from the QHY, stack the RGB from ASI and crop the horizontal axis of the QHY from 6252 to 6248 and after it, align the RGB with the QHY stack. Is this the correct approach?

Thanks and CS,
Georg

PS: I assume that there is nobody in our community who wants to swap the ASI2600MC (with M48 and M54 adapter) for a QHY 268C, right?

Both cameras are using the same exact sensor, so everything should match up fine if you register the stacks from each filter to eachother. There should be exactly the same number of pixels in all of your images & there will be some stacking artifacts you’ll need to crop out anyway. I do this process all the time with my images.
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kuechlew avatar
While I totally agree with matthew.maclean and astrodawg in case you don't want to follow their advice you can just throw all your images with QHY268M into a PixInsight ImageContainer and apply a dynamic crop at it, getting rid of the 4 pixels.

Clear skies
Wolfgang
Georg N. Nyman avatar
While I totally agree with matthew.maclean and astrodawg in case you don't want to follow their advice you can just throw all your images with QHY268M into a PixInsight ImageContainer and apply a dynamic crop at it, getting rid of the 4 pixels.

Clear skies
Wolfgang

Oh, wow, that is a jolly good idea - I shall try it of course!
Thanks
Georg