NGC7023 DSLR/CCD MONO Comparison ***Reprocessed CCD ..

[ApophisAstros]

CCD Mono
110 x 180s LRGB
No Binning
Dithered PHD2/APT
Imaging telescope or lens:SkyWatcher 120ED Imaging System for Canon DSLR Cameras
Imaging camera:ZWO ASI183MM Monochrome 4/3" CMOS USB3.0 Deep Sky Imager Camera
Mount:Skywatcher EQ6-R PRO Synscan
Guiding cameras:Skywatcher 9x50 Finderscope,  QHYCCD 5L-II MONO
Focal reducer:Skywatcher 0.85x Focal Reducer/Corrector for Evostar-120ED
Software:DeepSkyStacker x64 by Luc Coiffier, Tony Cook, David C. Partridge Deepsky Stacker 4.1 64bit,  Astro Photography Tool,  ADOBE PHOTOSHOP CC
Filters:ZWO CCD LRGB Filter-Set 36mm,  zwo EFW 7-position Filter Wheel for 36mm Unmounted Filters
Accessory:QHYCCD PoleMaster
Resolution: 5496x3672
Dates: Sept. 28, 2018
Frames: 110x180"
Integration: 5.5 hours
Avg. Moon age: 18.08 days
Avg. Moon phase: 88.07%
Astrometry.net job: 2276600
RA center: 315.403 degrees
DEC center: 68.167 degrees
Pixel scale: 0.629 arcsec/pixel
Orientation: 282.663 degrees
Field radius: 0.577 degrees
Locations: Home, Worthing, West Sussex, United Kingdom
Data source: Backyard

DSLR Modded
26x300s
Imaging telescope or lens:SkyWatcher 120ED Imaging System for Canon DSLR Cameras
Imaging camera:Canon EOS 750D DSLR - Modded for Astro Imaging
Mount:Skywatcher EQ6-R PRO Synscan
Guiding telescope or lens:SkyWatcher 120ED Imaging System for Canon DSLR Cameras
Guiding camera:Skywatcher 9x50 Finderscope
Focal reducer:Skywatcher 0.85x Focal Reducer/Corrector for Evostar-120ED
Software:Astro Photography Tool,  Deep Sky Stacker 3.3.4
Accessory:QHYCCD PoleMaster
Resolution: 5218x3264
Dates: Aug. 28, 2017
Frames: 26x300"
Integration: 2.2 hours
Flats: ~1
Bias: ~16
Avg. Moon age: 6.63 days
Avg. Moon phase: 42.00%
Bortle Dark-Sky Scale: 1.00
Mean SQM: 21.80
Temperature: 13.00
Astrometry.net job: 2276714
RA center: 315.315 degrees
DEC center: 68.094 degrees
Pixel scale: 0.974 arcsec/pixel
Orientation: 250.523 degrees
Field radius: 0.833 degrees
Locations: Home, Worthing, West Sussex, United Kingdom
Data source: Unknown
Same scope/Focal Reducer
Same location
Roger

[Carole]

The comparison to your previous DSLR image is quite marked.  You've done very well from Worthing with this target.

The nebula though is far too blue as you have processed it. 

Well done

Carole

[Roy]

I'm not sure what this shows other than the field of with the DSLR is wider. There is more detail in the CCD image, but that would be expected as the exposure was approximately 2.5 times longer. Irrespective of that, I wish I'd acquired either of those images, well done.

Roy

[MarkS]

That's a good choice of target and you appear to have some great data there.  But as Carole has pointed out, something has gone wrong with the processing: the nebula and all the nearby stars have been turned blue.

I can't suggest how to fix it because I'm not familiar with LRGB processing.  I definitely think you should read a good tutorial on LRGB.

Mark

[Carole]

I have had a chat with Roger regarding this and it looks like he was a bit too heavy handed using lab colour.

Carole

[NoelC]

Nice comparison Roger
Shows what the scale and sensitivity of your CCD can do!

Noel