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Multi Session with different Cameras and Lenses  

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(@mkeller0815)
White Dwarf Customer
Joined: 12 months ago
Posts: 22
March 5, 2021 10:12  

Hi everyone,
we are planning a parallel multi session with different cameras and lenses (all around 50mm on APC and full frame). No tracking so we will have a lot of images with relatively short exposures (about 5 seconds each). Can APP handle image session from different cameras with images that slightly differ in size and resolution? What would be the best workflow to stack several hundert images per session to one final image? 


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3216
March 5, 2021 10:24  

Hi Mario,

Yes, APP is able to combine images from all kinds of sensors and FOV's. Important is that all these have their own calibration data. The amount of data you're talking about is tricky though, in the sense that it would require a good, modern system with loads or memory, SSD etc.

Best thing in any case is to first make the integrations per setup, if that entails e.g. 1000 images per integration, chop that up into smaller parts (like 250 on a good system) and make that into a nice, processed linear result, calibrated and all. Do this for each setup. Then you can load those integrated results as lights again and proceed as normal to register and integrate that.

Do note that a very short exposure would require a fast lens, as the signal-to-noise might get quite low otherwise. I think it will be ok, but maybe do a few test shots first to see if APP processes all fine.


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(@mkeller0815)
White Dwarf Customer
Joined: 12 months ago
Posts: 22
March 5, 2021 11:09  

Hi Vincent,

thanks for the advice. So I set the "save calibrated images" option for all the sets and just calibrate, or just generate a "final" image per set / session and than in a second step integrate the results from the previous integrations into the final integration with each set (from each camera) as one session and with the split up integrations (like sets of 4x250 of 1000 images per camera) as images within one session, right?
For the short exposures - I'm aware of that. But for this situation (4 cameras in 3 different locations and all without a tracker) we will crank up the ISO a little and see what we get out of that. 

 


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3216
March 5, 2021 11:31  
Posted by: @mkeller0815

Hi Vincent,

thanks for the advice. So I set the "save calibrated images" option for all the sets and just calibrate, or just generate a "final" image per set / session

A final image is fine, just keep it linear. You can do it in multiple ways like saving the calibrated frames and then combine those with the rest. Issue with that is likely so much data that it might not be feasible, hence why a final integration is easier to process together and the quality between the workflows will not be dramatically different.

and than in a second step integrate the results from the previous integrations into the final integration with each set (from each camera) as one session and with the split up integrations (like sets of 4x250 of 1000 images per camera) as images within one session, right?

Correct!

 

For the short exposures - I'm aware of that. But for this situation (4 cameras in 3 different locations and all without a tracker) we will crank up the ISO a little and see what we get out of that. 

 

Ok, keep us posted, interesting session that will be. 🙂

Good luck! Vincent


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(@mkeller0815)
White Dwarf Customer
Joined: 12 months ago
Posts: 22
March 5, 2021 11:51  
Posted by: @vincent-mod

A final image is fine, just keep it linear.

That means just save the unstretched version of the stacked image, right? 


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3216
March 5, 2021 11:54  

Yes, so APP will do that automatically. When you press the "Integrate" button, APP saves the integrated result to the work-directory as a lineair, integrated fits.


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