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 Post Posted: Thu Nov 09, 2017 9:00 pm 
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Joined: Sat May 23, 2015 9:18 am
Posts: 50
Hi Sam, ;)
Hi All,

A classical DSO target, NGC 7331 galaxy for this thrird test with my new camera
ASI 385. I use my 300/1600 Newtonian and no filter to have maximum light
flux. But the main drawback is to have a correct white balance, and I failed
here !

For this session, I take care to set capture in 16 bits during November 7/8 night.
I only mixed 5 seconds exposures. I 've posted the final image, a raw image, a stack
with 10 images unprocessed, and a stack with 10 images and DDP processing. It may
be interesting for EEA fans.

I previously have a little problem : on the Raw image, stars were saturated but the
level is not at 254 as expected for 8 bits mode. It seems that the dynamic is reduced
or cut by a threshold. It was just a problem of Gamma adjustment, to set to 50%
in SharpCap. And now it's OK !!

An other great new : ZWO changed the minimum value for the anti-amp glow activation.
Previously it was 1 sec, now it's 500 ms. Very very cool for bright DSO imaging !
I have a NGC6905 to process...
To be continued...


SETUP :
--------
Newtonian Orion Optics 300 mm F/D 5.3, on EQ-6 Mount
------------------------------------------------------

ZWO ASI 385 without filter,
Acquisition software : Sharcap 3.0.
1329 x 5 seconds exposures.
Gain = 388
105 Darks.

Visual sort out of Raw images.
Registration with DSS.
Processing and post-processing with Iris + Photoshop.


Final image, resized at 80% :

Image


A raw 5 sec exposure image, resized at 80% :

Image


10 raws stacking resized at 80%, no processing, no darks :

Image


10 raws stacking resized at 80%, DDP processing, no darks :

Image


Albéric


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