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Old 16-07-2015, 01:20 AM
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cometcatcher (Kevin)
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The Trifid Nebula in 30 seconds

I think this is more natural looking than the 584 frame version I did. I need to go back to the drawing board.

GSO 10" F4 Newt, CLS filter, Pentax K-5 at ISO3200.
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  #2  
Old 16-07-2015, 09:15 AM
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scagman (John)
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Hi Kevin,

Thats really nice looking, esp for a 30sec image.

Cheers
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  #3  
Old 16-07-2015, 10:58 AM
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ZeroID (Brent)
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Nice one Kevin,

How much and what processing was required ?
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  #4  
Old 16-07-2015, 12:56 PM
raymo
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M20 is a good choice for a single frame isn't it Kevin. It is interesting that
you think your single frame looks more natural than your multi frame
effort; no matter what I do, I can't get my stacking of frames of Omega
Cent. to come up with a result as good as the single frame I recently
posted.
raymo
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  #5  
Old 16-07-2015, 02:04 PM
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rustigsmed (Russell)
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its definitely nice kevin,
I think you other version was just spoilt from seeing or focus?
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  #6  
Old 16-07-2015, 07:20 PM
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cometcatcher (Kevin)
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Quote:
Originally Posted by scagman View Post
Hi Kevin,

Thats really nice looking, esp for a 30sec image.

Cheers
Thanks John.

Quote:
Originally Posted by ZeroID View Post
Nice one Kevin,

How much and what processing was required ?
Not much Brent. Just loaded the RAW into photoshop and I think I just did auto colour and that was about it.

Quote:
Originally Posted by raymo View Post
M20 is a good choice for a single frame isn't it Kevin. It is interesting that
you think your single frame looks more natural than your multi frame
effort; no matter what I do, I can't get my stacking of frames of Omega
Cent. to come up with a result as good as the single frame I recently
posted.
raymo
Yeah it's weird isn't it. We're doing it wrong, somehow.

Quote:
Originally Posted by rustigsmed View Post
its definitely nice kevin,
I think you other version was just spoilt from seeing or focus?
The secondary heater could have been causing thermal currents on the other one too Russ. It's just.... really soft for some reason.
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Old 17-07-2015, 12:59 PM
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5ash (Philip)
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Hi Kevin ,
Is it worth selecting the best images and just stacking those . You could possibly put all 584 images into DSS and use those images that DSS's measure of image quality are above a "certain value" , or manually check them and select the best as planetary imagers do ( hard on the eyes and time consuming , what they call " lucky imaging). I used to do a lot of video imaging where to get the best results you need to sift through 100's of frames and select the best.
Regards philip
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Old 17-07-2015, 02:55 PM
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That's such an impressive image Kevin considering the simple workflow. I've seen some great shots also from some of the newer DSLRs - esp the Canon EOS 6d which has a full frame and big pixels and newer image processing s/w in camera. Makes you wonder how the future SLRs will compare to OSC CCDs (cooling issues notwithstanding).

Does however make me realise I need to get out to darker skies if I'm going to be satisfied with shooting from an unmodded DSLR :-/
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  #9  
Old 17-07-2015, 10:29 PM
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Quote:
Originally Posted by 5ash View Post
Hi Kevin ,
Is it worth selecting the best images and just stacking those...
Regards philip
I might just have to do that Phillip. I hate wasting deep sky subs though lol.

Quote:
Originally Posted by tileys View Post
That's such an impressive image Kevin considering the simple workflow. I've seen some great shots also from some of the newer DSLRs - esp the Canon EOS 6d which has a full frame and big pixels and newer image processing s/w in camera. Makes you wonder how the future SLRs will compare to OSC CCDs (cooling issues notwithstanding).
Thanks Tileys. It does seem DSLR's are getting better all the time. A mate just bought an Astro 6D from Central DS. As good as an OSC CCD I reckon going by the results he's getting.
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  #10  
Old 17-07-2015, 10:48 PM
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Kevin, I have a single unprocessed frame, and a single processed one, taken with my 8" also 30secs @ ISO 3200 which I could post to show the difference in light grasp between my 8 and your 10. I also have a 60 sec @ ISO 3200 that I have on Astrobin which I have processed [ that's a joke]. Would you mind if I posted them here, or as a separate thread, or not steal your thunder at all? Your choice.
raymo

Last edited by raymo; 18-07-2015 at 12:53 AM. Reason: correction
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  #11  
Old 18-07-2015, 12:33 AM
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cometcatcher (Kevin)
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Put them in this thread if you like Ray.
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  #12  
Old 18-07-2015, 01:34 AM
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First pic same as Kevin's, but with 8". Second image the same except some basic processing. Third image is 60 secs @ ISO 3200 plus some processing. First one shows difference in light grasp between my 8"
and Kevin's 10". Other two show newbies that passable images of
brighter objects can be obtained with single frames before moving on to stacking.
The third image is in Astrobin. Best viewed at 50% screen.




http://www.astrobin.com/full/194946/0/
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Last edited by raymo; 18-07-2015 at 01:46 AM. Reason: more info
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  #13  
Old 18-07-2015, 11:21 AM
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cometcatcher (Kevin)
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Quote:
Originally Posted by raymo View Post
Other two show newbies that passable images of
brighter objects can be obtained with single frames before moving on to stacking.
That's very true Ray. There's a heap of objects up there that make fine images with a single exposure. In fact, when I load a single 16 bit RAW frame into photoshop, the colours are very rich, much nicer than what comes out of a DSS stack. It takes a lot of effort to put the colour BACK IN after DSS sucks it out!
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  #14  
Old 18-07-2015, 04:33 PM
Cimitar (Evan)
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Quote:
Originally Posted by cometcatcher View Post
I think this is more natural looking than the 584 frame version I did. I need to go back to the drawing board.

GSO 10" F4 Newt, CLS filter, Pentax K-5 at ISO3200.
Hi Kevin, great image! I really like what appears to be an extremely flat field across the photo.

The black point is excellent as well. How do you find the CLS filter, does it help with light pollution?

Cheers
Evan
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  #15  
Old 19-07-2015, 12:43 PM
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Quote:
Originally Posted by Cimitar View Post
How do you find the CLS filter, does it help with light pollution?

Cheers
Evan
Thanks Evan. The CLS does help with LP, but it also "wakes up" Ha response in unmodified cameras like mine. So to take better nebula pics, especially ones rich in Ha, I use the CLS or my Baader LP filter.
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