Hello!,
I have tried to accumulate some hours of exposing , to try to shown the dust around the bright Iris, but also to have a color information on weak dust clouds. . Some noise is present but perhaps it is the price I have to pay to try to have a little bit of detail and color on the darker parts.
Link and data details:
http://www.astrofabiomax.it/ngc7023.html
Cheers,
Fabiomax