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Post by Dragon Man on Sept 17, 2017 13:43:44 GMT
I don't have any problem getting coloured stars with the Revolution 224 Here is an image I took of Carina Nebula consisting of 3 x 20 seconds:
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elpajare
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Post by elpajare on Sept 17, 2017 16:14:05 GMT
Hey Ken, what scope have you used in this shot?
Any filter too?
And Gain?
Some postprocessing?
Thanks
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Post by Dragon Man on Sept 18, 2017 10:40:04 GMT
Carlos, If I remember correctly I used the Meade SN10 Schmidt-Newtonian reflector.
Filter was UV/IR cut 'L' filter from Astronomiks.
Gain - Zero
Post-processing - None. Just the brightness/contrast in the RisingSky capture software.
The image is a screen Grab directly from the Live feed.
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elpajare
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Post by elpajare on Sept 18, 2017 10:55:32 GMT
Thanks Ken, nice shot.
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Post by Dragon Man on Sept 18, 2017 12:14:07 GMT
Thanks Carlos Star colours are one of the hardest things to capture.
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elpajare
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Post by elpajare on Sept 18, 2017 14:50:01 GMT
Yes, I see that it is difficult, I did not think it would be so complicated.
Influence many things, type of telescope, type of chip, exposure, magnitude of the star ...... and sky conditions. Between others.
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Deleted
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Post by Deleted on Sept 20, 2017 1:21:13 GMT
One thing I've noticed is that I can see star colours quite well in the trailed images as the mount slews but they disappear when the mount stops.
Does this suggest that during most of our observations we are over exposing the stars and washing out their colours?
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elpajare
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Post by elpajare on Sept 20, 2017 7:44:41 GMT
Maybe this is one of the problems. Sensibility to the colors of the chip maybe another.
The result is that our photos are not as realistic as they should be.
This subject is not studied at all, al least in Videoastronomy.
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Post by howie1 on Sept 20, 2017 11:51:39 GMT
Indeed, not studied nor mentioned much. And great timing ... !!! I have just today been reading stuff from www.clarkvision.com an award winning photographer. The way he treats the colours in his astrophotos is very interesting. Many shots his sky colours are unlike most astrophotos you see! NOTE ... His site is very old school ... when you click on the hyperlink below you will see what looks like a bunch of hyperlinked menus at the top of the page. Do NOT click on them .... to read the article I am posting, you have to scroll well down below the menu you see when you click the link ...... the actual article is well down underneath the top menu which you first see! Look at the right hand side scroll bar and you'll see there's heaps of words and stuff well below that first menu on that page. www.clarkvision.com/articles/color.of.the.night.sky/and this one specifically on the colour of stars ... www.clarkvision.com/articles/color-of-stars/
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Post by Dragon Man on Sept 20, 2017 13:54:34 GMT
good info links Howie
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elpajare
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Post by elpajare on Sept 20, 2017 14:55:25 GMT
Very good article. I will try to approach realistic results with my poor means.
I think that we do not give up getting the best result possible with our Videoastronomy techniques
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elpajare
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Post by elpajare on Oct 14, 2017 8:33:27 GMT
Misam is a 3th magnitude Variable Double Star appearing in the constellation Perseus. It is 113 light years from our solar system. It is a yellow-orange giant of spectral type K0III. Its surface temperature is 4660 Kelvins - 19% cooler than the Sun's - and it is 10.4 times the Sun's diameter in size Adjust Level/Curves/Contrast/Colour with GIMP. Bresser AX102+Risingcam IMX178 10x10" stack/mean. Gain máx.
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