DARK, BIAS and FLAT images

NchAstro

Is there a way to create/get DARK, BIAS and FLAT images? I don't see how I can create these files while stargazing as the process will discard images that do not work for the stacking process.

I understand there is a MasterDark file created, but I would like to be able to create all above images as well. If there is no current way to do that it would be a great addition to the S50. This could be an advance option and the app could guide and help the user on creating these images. Please consider for the next round of updates.

Thanks

RoscoeD

Are you trying a live stack or a Plan". Under Live stack there is an option to collect them and ASI Air will create masters. I only use this for outreach events where the image is being continuously built.

When shooting for quality (i.e using a plan), use Autorun to collect calibration frames.

Fredvallee

RoscoeD I am wondering if you describe the seestar app as I do not see the options you are mentioning in my seestar app. Do I miss something?
Frederic

AstroImg@ZWO

Don’t worry, the S50 will create these images automatically

Psion

Seestar takes dark frames automatically, flats certainly don't and aren't needed on such a small chip.

NchAstro

I think my questions was not very clear. I am using the Seestar S50 and the Seestar iOS app. In the app's "Advance Feature" I turned ON "Save each frame in enhancing". Then begin Startgazing, point to M31 and record for say one hour. I then connect the S50 to my computer via USB and these are the files I would see:

Folder 'DarLibrary' containing one single file named "MasterDark_xxxxx.fit"

Folder "MyWorks/M 31" containing the final stacked file in FIT and JPG

Folder "MyWorks/M 31-sub" containing ALL single photos (not rejected) in FIT and JPG.

I initially was simply asking how to get multiple Dark, Bias and Flat files to process the above files myself. I don't see how I can do that using the app. For instance, there is no was to take multiple 10 seconds photos covering the sensor during the night session.

Psion

Stored FIT images already have the dark frame subtracted and do not need to be subtracted again. The dark frame also contains the bias frame. Due to the small camera chip, there is no need for a flat frame, so you really only need to download the FIT file and process it by stacking in some astronomy software.

Fredvallee

Psion Hi Psion, thank you for this explanation, not obvious to guess a priori. So it helps, I wonder if it's worth for me to reprocess my first attempts. You undestand that I substracted the dark frames rotated 90° with WBPP in Pixinsight. Will it make any difference if I redo my process without substrating the darkframe?
thanks

Psion

If you double subtract the dark frame, it's wrong. It probably won't happen much, but it's unnecessary.