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Old 15-04-2018, 10:25 PM
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First light for my celestron 11" RASA

an unguided and unprocessed shot of eta carinia NGC3372 of 1 second, 5 seconds 10 seconds 15 sec 20 sec 25 sec, 30sec, 40sec, 60 sec and 90sec at iso 400 with the canon 450d.and the celestron RASA 11
OMG this is so awesome and i am finding focus is critical i havent taken darks, flats or bias's yet
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Old 15-04-2018, 10:25 PM
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the rest
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Old 16-04-2018, 05:47 AM
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Wow, now that is some great shooting, I can see you
are going to have some fun with your new toy, well done indeed.

Leon
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Old 16-04-2018, 05:47 AM
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forgot to say no light pollution filter used and the light pollution was bad
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Old 16-04-2018, 05:54 AM
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f/2.2 is too fast for the light pollution
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Old 16-04-2018, 06:29 AM
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Quote:
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f/2.2 is too fast for the light pollution
Absolutely agree but how much fun at a dark sky sites
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Old 16-04-2018, 06:38 AM
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Absolutely agree but how much fun at a dark sky sites
Hmmm. That didn't come out how I meant it. I was light-heartedly suggesting it was so fast that the light pollution doesn't matter. Which is true to a degree... a fast scope gives you an advantage because you need more signal to minimise the effects of light pollution.
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Old 16-04-2018, 07:22 AM
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Hmmm. That didn't come out how I meant it. I was light-heartedly suggesting it was so fast that the light pollution doesn't matter. Which is true to a degree... a fast scope gives you an advantage because you need more signal to minimise the effects of light pollution.
well it's been a while since I have done any deep sky stuff and this should give me some practice. Need to relearn PI. Also need to learn how to do flats with it, and suggestions
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Old 16-04-2018, 07:30 AM
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well it's been a while since I have done any deep sky stuff and this should give me some practice. Need to relearn PI. Also need to learn how to do flats with it, and suggestions
I'm sure that your PI chops will return quickly Will be interesting to see if flats are tricky. At least you won't have to worry about dust too much - it will be well out of focus.
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Old 16-04-2018, 07:31 AM
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Is there any way to mitigate diffraction spikes with these? We need a BlueTooth CCD Cam so you don't need cables and such

Nice preliminary results! Impressive.
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Old 16-04-2018, 07:35 AM
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Quote:
Originally Posted by RickS View Post
f/2.2 is too fast for the light pollution
Very promising first light images! The right camera will make a big difference. No disrespect to the venerable 450D ( and i still have my cooled version), something like an ASI1600MC-C would really take advantage of that scope. Fitting within the central obstruction it will maximise light grab, increase contrast, and with its ultra low noise you can take very short subs to escape sky glow saturation. It would excel at fast narrowband, if you go for a cooled mono camera (like the ASI1600MM-C), but a filter drawer system (try Teleskop-Services) would be needed to avoid a filter wheel blocking signal. Add a set of high speed narrowband filters and you have it all. An exciting project for sure.
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Old 16-04-2018, 08:26 AM
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Is there any way to mitigate diffraction spikes with these? We need a BlueTooth CCD Cam so you don't need cables and such

Nice preliminary results! Impressive.
You’ve got to wrap the cables in a circular way so that the diameter of the circle is about a third of the aperture.
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Old 16-04-2018, 08:44 AM
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Very nice...

I had a look at pricing for RASA/Fastar/Hyperstar... prohibitive.
On the other hand, Freestar alternative, being much cheeper, is not a real alternative.

Does someone know about anything it the middle of those two?
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Old 16-04-2018, 09:01 AM
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@ h0ughy - more clouds huh?
Oh wait, it's Eta.
Beautiful mate, congrats on first light.
Gee, that didn't take you long to take out of the box and start imaging.
You're exactly like me {/not}.

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Old 16-04-2018, 09:09 AM
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forgot to say no light pollution filter used and the light pollution was bad
That signal is great and it'll only get better with a filter.

Best
JA
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  #16  
Old 16-04-2018, 09:19 AM
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Quote:
Originally Posted by RB View Post
@ h0ughy - more clouds huh?
Oh wait, it's Eta.
Beautiful mate, congrats on first light.
Gee, that didn't take you long to take out of the box and start imaging.
You're exactly like me {/not}.

I wait with baited breath for the unboxing of the doorstop
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Old 16-04-2018, 09:20 AM
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You’ve got to wrap the cables in a circular way so that the diameter of the circle is about a third of the aperture.
Thanks for that information. So how do you do flats
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Old 16-04-2018, 09:22 AM
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Quote:
Originally Posted by glend View Post
Very promising first light images! The right camera will make a big difference. No disrespect to the venerable 450D ( and i still have my cooled version), something like an ASI1600MC-C would really take advantage of that scope. Fitting within the central obstruction it will maximise light grab, increase contrast, and with its ultra low noise you can take very short subs to escape sky glow saturation. It would excel at fast narrowband, if you go for a cooled mono camera (like the ASI1600MM-C), but a filter drawer system (try Teleskop-Services) would be needed to avoid a filter wheel blocking signal. Add a set of high speed narrowband filters and you have it all. An exciting project for sure.
You might be onto something there Glen. May look into that option. BTW I undeleted your post. It was constructive
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Old 16-04-2018, 09:37 AM
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Quote:
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Thanks for that information. So how do you do flats
With a giant mallet?
(No idea sorry)
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Old 16-04-2018, 10:13 AM
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Thanks for that information. So how do you do flats
You could do it in the classical way or more easily with either one of these.....
1. Use Adobe Camera Raw or
2. on some Nikon cameras there is a vignette control. Perhaps also on Canon.


Here is the function in Adobe Camera Raw (start at 44 seconds in for an intro and then skip to 12:40 ish for Processing in Adobe, GRRRRrrrr software wont go there automatically despite instruction to do so..... Oh well maybe watch the lot it's entertaining and interesting)



Best
JA

Last edited by JA; 16-04-2018 at 10:28 AM.
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