M31

This frame is assembled from the imaging results of several participants using different telescopes, different cameras, and from different light pollution zones.
The Pixinsight In Russian project carried out very long and meticulous work calibrating each participant's data, because, as is the tradition with our folks, many simply did not calibrate their shots.
All data was calibrated using the Multiscale Gradient Correction technique with the help of well-calibrated separate reference wide-field WIFD shots. The guys with the Samyangs executed this brilliantly, thank you to them for that - well done.
The data was combined by summing the stacks with preliminary linear alignment, and overall everything was done to standard:
SubStacks: MSGR -> SPCC - BXT -> SXT -> linear fit -> master stack
Master Stack: MSGR -> SPCC -> BXT/SXT/NXT -> CIE-L/RGB -> GHS -> HDRMT -> LRGBCOMB -> AdobePhotoshop.

List of participants, tags are on VK:
(@da_krylov) (Dmitry Krylov) - C11 - 8 hours - 2600 mc pro
(@da_krylov) (Dmitry Krylov) - Quattro 150 - 5 hours - Sony a7rm4
(@astro_dinsk) (Alexey Gennadievich) - William Optics Z 81APO - 3 hours - 294mc pro
(@id663648307) (Pavel Nikolaev) - PDS150 - 5 hours - 294mc pro (Antlia trial band filter)
(@id778875115) (Maxim Gramotunov)- PDS130 - 4h - Canon 550D
@ItHighlander (Anton, Rostov Astro Club)- 6h Askar 103 APO - QHY268M Pro - (Antlia RGB)
TOTAL: 31 hours

List of WIFD participants, tags are on VK:
(@kostyan_92) (Konstantin Grigoriev) - Samyang 135 f2 - 4h - Sony A6300
(@Lzaza1975) (Alexey, Lzaza) - Samyang 135 f2 - 7h - 533mc pro
(@cerba) (Anastasia Tretyakova) - Nikkor 70-200mm F/2.8 - 3h - Nikon d850
TOTAL: 14 hours.
Data processing, @svarshchik911 (welder 911)

A big thank you to everyone who participated, this was the first experimental project for collective imaging by Pixinsight In Russian.