The image shown of the Iris nebula is over 62 hours of data using the combined data sets of the C14, RASA 11 & Altair ETX-115.
I had to use a different approach to bringing the data together which worked really well considering that the C14 focal length at F11 is over 5 times that of the smaller telescopes.
This is how I approached the integration challenges.
The C14 gives you an up-close and personal perspective allowing you to home in on the fainter details however it needs a lot of data to smooth out the peripheral regions which is perhaps better done with faster instruments under my Bortle 7 skies.
The RASA grabs data fast but for most targets can't really be considered as up-close & personal. My rationale was to use the C14 to capture the detail & try & use the RASA 11 and the Altair refractor to aid with the SNR on the background data.
I drizzled the RASA data to x4 and the Altair data to X6 firstly using WBPP to calibrate and register the initial data. Fast integration allowed the integration & production of the drizzle files and the task was fairly easy from that point using a drizzle crop on the smaller telescopes data that approximately matched the C14 field. The masters were then solved to give a WCS astrometric solution. They were then added into the PI align by coordinates module and the C14 integration used as the registration master. This produced a set of masters of each RGB subs which was a total of 11 masters. I then registered again these masters to eliminate any residual distortions of the optics of each system. This last step was deemed necessary as distortion had crept into the masters. I then combined each set of related colours to produce the typical LRGB required masters.
The additional data from the 2 smaller optical systems has improved the original integration substantially and it confirms that align by co-ordinates is a robust way to align different image scales especially if you can use drizzle to close the image scale gap.
A larger image can be found here https://www.astrobin.com/ucaict/B/
As always let me know what you think of the new image.
I wish you all clear skies.
