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 Post subject: ZWO 178 first light
 Post Posted: Wed Oct 11, 2017 3:35 am 
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Joined: Sat Jul 15, 2017 11:41 pm
Posts: 8
Attachment:
File comment: My first Hargb image
ZWO 178 mm cool
80 minutes Ha
30 minutes each of RGB
Skywatcher Quatro 8"
CGX mount
SSAG
PHD guiding. SGP. Pixinsight
Taken Oct. 8 under a full moon and in a white zone.
Calgary, AB

NBRGBCombination1.jpg
NBRGBCombination1.jpg [ 264.5 KiB | Viewed 454 times ]


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 Post subject: Re: ZWO 178 first light
 Post Posted: Mon Oct 23, 2017 11:37 am 
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Joined: Mon May 08, 2017 3:58 pm
Posts: 5
Hi jimdrever,
very nice image. If i can i would only suggest you to make the background a bit darker (but maybe is only due to my monitor...).
Since I have 2 newton OTAs (1000 mm f/5 and 650 f/5) and a SSAG and i'm interested to buy this camera i would ask you few technical questions about the photo:
- how long were your subframes?
- which kind of guidescope and which guide settings did you use?
I ask you these questions in order to understand how to manage such tiny pixels (2.4 x 2.4 micrometers) with my OTAs (650-1000 mm) without star trailing.
Lastly i would know something about the capture settings and the calibration files (bias, flats, darks) that you have used.
Thanks in advance

Matteo

_________________
OTAs: Skywatcher 200/1000 and Skywatcher 130/650 PDS
Mount: CG5GT
Camera: ASI 120 MC


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 Post subject: Re: ZWO 178 first light
 Post Posted: Sat Oct 28, 2017 7:52 pm 
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Joined: Sat Jul 15, 2017 11:41 pm
Posts: 8
GMatteo wrote:
Hi jimdrever,
very nice image. If i can i would only suggest you to make the background a bit darker (but maybe is only due to my monitor...).
Since I have 2 newton OTAs (1000 mm f/5 and 650 f/5) and a SSAG and i'm interested to buy this camera i would ask you few technical questions about the photo:
- how long were your subframes?
- which kind of guidescope and which guide settings did you use?
I ask you these questions in order to understand how to manage such tiny pixels (2.4 x 2.4 micrometers) with my OTAs (650-1000 mm) without star trailing.
Lastly i would know something about the capture settings and the calibration files (bias, flats, darks) that you have used.
Thanks in advance

Matteo


Hi Matteo
Sorry for the late reply.

Sub frame exposures:
Ha - 2 min.
RGB - 1 min. each
Camera settings were Highest Dynamic Range.

I used PHD Guiding with the SSAG and 50mm scope.

Settings for PHD were all over the place. I used my SW Quattro 8 F4 scope.
I think it was a balance problem because my HD 11 guides very well.
Usually PHD settings are:
RA and Dec aggression - 70 and 60
Hyst. 15
Those numbers will change depending on seeing. I always run the guide assistant before imaging.

Small pixels you are right!
The camera is over sampled with this scope so poor focus and tough guiding....etc.
Now I'm using my Orion 80ED CF with this camera. Much more suited but longer exposures.

For calibration I used:
20 biases
20 darks
30 flats
Processed in Pixinsight.

Not a great photo but the learning curve for me is still quit steep :)
Lots of fun though

Hope this helps Matteo

Jim


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 Post subject: Re: ZWO 178 first light
 Post Posted: Mon Oct 30, 2017 10:01 am 
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Joined: Mon May 08, 2017 3:58 pm
Posts: 5
Thanks Jim, this helps a lot!
Maybe it could be also useful to use binning for long exposures (obviously with a price of a low resolution)
Thanks again!

Matteo

_________________
OTAs: Skywatcher 200/1000 and Skywatcher 130/650 PDS
Mount: CG5GT
Camera: ASI 120 MC


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