The Iris Nebula, also NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +7 star, SAO 19158. It shines at magnitude +6.8. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alphirk). It lies 1,300 light-years away and is six light-years across. [Source: Wikipedia] 

Capture Information:
The image was captured with the iOptron CEM120 mount, the venerable Meade 12"LX200 SCT OTA, and my QHYCCD QHY294m Pro mono CMOS camera at F7.16 (2182mm FL). 
Astronomik's Lum, Red, Green and Blue broad band filters were used.  Additional Lum subs were taken at 15s to manage the extremely bright area in the heart of the nebula.

Image Information -- 2023
Lum : 120 subs @ 300 sec (10.00hr) on Aug 11th, 13th and 15th.
Lum:    40 subs @ 15 sec  (0.17hr) on Aug 12th.
RED :   20 subs (1.67hr)  on Aug 11th, and 13th.
GRN :  20 subs (1.67hr) on Aug 12th, and 13th.
BLU :   20 subs (1.67hr) on Aug 12th, and 13th.
All exposures were at 5 minutes (300s) each (except for the 15s subs), 1600 gain, 56 offset, 1x1 bin and -10C (more like -5C).

Processing was done with PixInsight, following (for the most part) Kayronjm's tutorial of Feb. 24th from several years back.
Lum @ 300 sec and 15 sec subs were used to develop the Luminance image.
R, G and B were collected for the color mix.
The 300 sec and 15 sec subs were initially separately integrated, cropped and DBE’d; and then combined using Pixinsight’s HDRComposition process.  This was done to better resolve the image’s extremely bright center.

North is to the right (pretty sure), and this is a slight crop due to the misalignment accumulation from so many different filters and times. 

Comments:
While the plan is to create all subs at -10C, I'm finding that the summer heat is only allowing the temp to reach around -5C.

This is the 5th time I’ve run at this target.  
The first was in September of 2015 with my Meade 12”LX200 fork mount, using the Atik 383L+mono CCD camera.
The second was in December of 2015 with my Meade 12”LX200 fork mount with the TMB 80SS refractor attached, and using the Canon 450DXsi camera, imaging at F6.3 (i.e. 504mm FL).
The third was in September of 2017 with my Celestron CGE Pro mount and demounted 12”LX200 OTA, using the Atik 383L+mono CCD camera.
The fourth was in September of 2019 with my iOptron CEM120 mount and demounted 12”LX200 OTA, using the Atik 383L+mono CCD camera.
This time we’re on the iOptron CEM120 mount, using the QHY294 pro mono cmos camera. 

I think this one is the best.


ONE LAST THING:
After completing the second look at the RA belt tension and cleanliness; and finding several of the mount’s structural bolts loose, I imaged the M17 Omega nebula.  
And as mentioned on that page’s summation, “unfortunately, the RA excursions persists, so the fix was not in”.
However, with the imaging of the NGC7023 Iris nebula, the RA has maintained a very acceptable behavior.
It should be noted that M17 was low in the South while NGC7023 was close to the pole in the north.