Elephant's Trunk - More Time (DSLR)

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STEVE333
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Elephant's Trunk - More Time (DSLR)

#1

Post by STEVE333 » Tue Aug 13, 2019 4:51 am

Beautiful night last night, and, system worked great. Guiding was about 1" rms which is good for me.

Total exposure is up to 4 hr 48 min. I processed the image using normal DSLR processing. The resulting image is a nice improvement over the earlier post which had only 1 hr 21 min total exposure. I'll be looking into processing as a NB image next (same data, just a different processing approach).

IMAGE PARAMETERS
WO Star71 telescope, Canon T3 (modified), STC Duo-Narrowband Filter, iOptron CEM40 EC Mount
Lights 32x540 sec (Total Exp 4 hr 48 min), Darks, SuperBias, Master Flat
BYEOS, PHD2, PixInsight

Elephant's Trunk Nebula
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Flickr Link: https://www.flickr.com/photos/125271061 ... ateposted/

Out of interest, the image below shows the Rejection_High image from the PixInsight ImageIntegration process. These are all the rejected pixels that were more than 3-sigma larger than the average. This rejection is done for each pixel of each image. Notice that all of the airplane trails are rejected. I'm right in the flight path for planes landing at the San Jose, CA airport. The trails are all removed (none evident in the final image), and, I never discard an image because of airplane trails.

Rejection_High Image
Image

Thanks for looking.

Steve
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii or ES ED102 CF + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera + Filter: Canon EOS Rebel T3 1100D (modified) + Triad Tri-Band or IDAS-LPS-D1 or STC Duo-Narrowband Filter
Software: PHD2; BYEOS; PixInsight; Starnet++ My AP website www.steveking.pictures

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Juno16
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Re: Elephant's Trunk - More Time (DSLR)

#2

Post by Juno16 » Tue Aug 13, 2019 1:43 pm

Wow, HUGE improvement!

That’s a bunch of time. How long do you pause between exposures for sensor cooling?

Great image Steve. Looking forward to your next one!

Thanks,
Jim
Scopes: Explore Scientific ED102 Triplet APO, Celestron Nexstar 130 SLT.
Mounts: Celestron AVX with Orion MM Autoguider, SLT;
Binoculars: Bushnell 10X50
Camera / Software: Nikon D5300 (Ha mod), Astrophotography Tool, PHD2, SharpCap v3.2, StarTools 1.6 alpha, PE14
Dog: Jack
Sky: Bortle 6
Astro Photos https://flickr.com/photos/157183480@N07 ... 7681236785
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Re: Elephant's Trunk - More Time (DSLR)

#3

Post by bobharmony » Tue Aug 13, 2019 1:53 pm

That is looking very nice, Steve. Love the added time on target!

Bob
Hardware: Celestron C6-N w/ Advanced GTmount, Baader MK iii CC, Orion ST-80, Canon 60D (unmodded), Orion SSAG
Software: BYE, PHD2, DSS, PhotoShop CC 2019, StarTools, Cartes du Ciel, AstroTortilla

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Re: Elephant's Trunk - More Time (DSLR)

#4

Post by Peppy » Tue Aug 13, 2019 2:43 pm

Stunning image, well done.
Scopes, SW102/AZ, SW ED80, WO Z61, VRC 6, LX200 Classic 8, ZWO 60MM guide scope, ZWO mini guide scope.Mount, Ioptron zeq25.
Cams, Cannon, T3 self mod, T2i self mod F/S, ZWO 120 mc.
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Re: Elephant's Trunk - More Time (DSLR)

#5

Post by helicon » Tue Aug 13, 2019 2:58 pm

Super Duper Steve! Looks great.
-Michael
Various scopes, 10" Zhumell Dob, ES AR152, AWB 5.1" Onesky newt, Oberwerk 25x100 binos, two eyeballs
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STEVE333
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Re: Elephant's Trunk - More Time (DSLR)

#6

Post by STEVE333 » Tue Aug 13, 2019 4:48 pm

BYE THE WAY - THIS DATA WAS COLLECTED WITH AN AVERAGE MOON PHASE OF 85%!!!

The Duo-Narrowband really acts like a SUPER LP filter.

Steve
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii or ES ED102 CF + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera + Filter: Canon EOS Rebel T3 1100D (modified) + Triad Tri-Band or IDAS-LPS-D1 or STC Duo-Narrowband Filter
Software: PHD2; BYEOS; PixInsight; Starnet++ My AP website www.steveking.pictures

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Re: Elephant's Trunk - More Time (DSLR)

#7

Post by MartinF » Tue Aug 13, 2019 7:24 pm

That looks great! The amount of exposure is quite a lot but the number of subs is still "only" 32 so it would be exciting to see your result if you want to pursue this one further. Why I write this is because my experience with the Canon DSLRs is that at about 60-80 subs things REALLY start to happen. The images get so much cleaner and easier to process.
__________________________________________________
Skywatcher HEQ5 + Orion MMAG, AstroTrac TT320X-AG
Zwo ASI1600MM-Cool + Canon EOS 550D (Baader modified)
Skywatcher 150-PDS, Sigma 500/4.5
Instagram: martin_f_photography , www.martinfransson.com
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Re: Elephant's Trunk - More Time (DSLR)

#8

Post by MariusD69 » Tue Aug 13, 2019 7:39 pm

Amazing! Great work, Steve!
Marius
Mount: HEQ5- EQMOD
Scopes: newt SW 150/750PDS, dobson SW 150/1200; SW 114/500; TS Photoline 80mm f/6 Triplet APO; SW ST80
Cameras: ASI294MC Pro; Atik 314L+mono; Canon 1100D; QHY5III-178m; QHY5L-II-m ; ASI224; Altair GPCAM 290M, GPCAM290C
Accessories: Baader MPCC; GPU KomakorrF4; TS Flat2; TS 0.79x FR/FF
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Re: Elephant's Trunk - More Time (DSLR)

#9

Post by STEVE333 » Tue Aug 13, 2019 8:08 pm

Juno16 wrote:
Tue Aug 13, 2019 1:43 pm
Wow, HUGE improvement!

That’s a bunch of time. How long do you pause between exposures for sensor cooling?

Great image Steve. Looking forward to your next one!

Thanks,
Jim

Thanks Jim. I use dithering, so, the time between images is about 60 sec.


bobharmony wrote:
Tue Aug 13, 2019 1:53 pm
That is looking very nice, Steve. Love the added time on target!

Bob

Thanks Bob - I too was happy to see the improvement.


Peppy wrote:
Tue Aug 13, 2019 2:43 pm
Stunning image, well done.

Thanks Peppy.


helicon wrote:
Tue Aug 13, 2019 2:58 pm
Super Duper Steve! Looks great.

Thanks Michael. You always have nice encouraging comments. Much appreciated.

Steve
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii or ES ED102 CF + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera + Filter: Canon EOS Rebel T3 1100D (modified) + Triad Tri-Band or IDAS-LPS-D1 or STC Duo-Narrowband Filter
Software: PHD2; BYEOS; PixInsight; Starnet++ My AP website www.steveking.pictures

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Re: Elephant's Trunk - More Time (DSLR)

#10

Post by STEVE333 » Tue Aug 13, 2019 8:30 pm

MartinF wrote:
Tue Aug 13, 2019 7:24 pm
That looks great! The amount of exposure is quite a lot but the number of subs is still "only" 32 so it would be exciting to see your result if you want to pursue this one further. Why I write this is because my experience with the Canon DSLRs is that at about 60-80 subs things REALLY start to happen. The images get so much cleaner and easier to process.


Thank you Martin.

Was your number of 60-80 subs at all dependent upon the length of exposures you took?

It is very difficult for me to get that many subs. I can only capture the Eastern portion of the sky, so that's one limit to the number of subs. Each sub needs to be at least 9 min long because of the narrow bands of the Ha and Oiii passbands, so, that also limits the number of subs. Lastly, at 78, how long I can stay up at night before "pooping out" also limits the number of subs. Of course clouds etc. play their role. I may be able to get out tonight for another 3hr 40min window of opportunity. At 10 min/image (including the dithering + settling time) that will be another 22 subs for a total of 32+22=54. Still shy of your 60-80 subs, but, maybe close enough? The total exposure would be just over 8 hrs. We'll see if my body agrees with my heart on this one tonight. May be a "game time" decision.

Appreciate your comments and suggestion.

Steve
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii or ES ED102 CF + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera + Filter: Canon EOS Rebel T3 1100D (modified) + Triad Tri-Band or IDAS-LPS-D1 or STC Duo-Narrowband Filter
Software: PHD2; BYEOS; PixInsight; Starnet++ My AP website www.steveking.pictures

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Re: Elephant's Trunk - More Time (DSLR)

#11

Post by MartinF » Tue Aug 13, 2019 8:53 pm

STEVE333 wrote:
Tue Aug 13, 2019 8:30 pm
MartinF wrote:
Tue Aug 13, 2019 7:24 pm
That looks great! The amount of exposure is quite a lot but the number of subs is still "only" 32 so it would be exciting to see your result if you want to pursue this one further. Why I write this is because my experience with the Canon DSLRs is that at about 60-80 subs things REALLY start to happen. The images get so much cleaner and easier to process.


Thank you Martin.

Was your number of 60-80 subs at all dependent upon the length of exposures you took?

It is very difficult for me to get that many subs. I can only capture the Eastern portion of the sky, so that's one limit to the number of subs. Each sub needs to be at least 9 min long because of the narrow bands of the Ha and Oiii passbands, so, that also limits the number of subs. Lastly, at 78, how long I can stay up at night before "pooping out" also limits the number of subs. Of course clouds etc. play their role. I may be able to get out tonight for another 3hr 40min window of opportunity. At 10 min/image (including the dithering + settling time) that will be another 22 subs for a total of 32+22=54. Still shy of your 60-80 subs, but, maybe close enough? The total exposure would be just over 8 hrs. We'll see if my body agrees with my heart on this one tonight. May be a "game time" decision.

Appreciate your comments and suggestion.

Steve
60-80 is not at all a fixed amount but I remember it being easier somewhere around there. Somewhere along the line you get to where the extra subs don´t really do that much. 54 will also bee good :) I found 5 minute subs to be somewhat of a sweet spot but that was for RGB. Narrowband is another beast and I used 10 minute subs for that.

No need to tell me about the weather and the "pooping out", I´m only 44 and I still have a hard time motivating myself to stay up all night :lol:
__________________________________________________
Skywatcher HEQ5 + Orion MMAG, AstroTrac TT320X-AG
Zwo ASI1600MM-Cool + Canon EOS 550D (Baader modified)
Skywatcher 150-PDS, Sigma 500/4.5
Instagram: martin_f_photography , www.martinfransson.com
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Re: Elephant's Trunk - More Time (DSLR)

#12

Post by STEVE333 » Tue Aug 13, 2019 9:07 pm

MartinF wrote:
Tue Aug 13, 2019 8:53 pm
60-80 is not at all a fixed amount but I remember it being easier somewhere around there. Somewhere along the line you get to where the extra subs don´t really do that much. 54 will also bee good :) I found 5 minute subs to be somewhat of a sweet spot but that was for RGB. Narrowband is another beast and I used 10 minute subs for that.

No need to tell me about the weather and the "pooping out", I´m only 44 and I still have a hard time motivating myself to stay up all night :lol:
"All night", at my age that mean anytime after midnight!! :asleep:
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii or ES ED102 CF + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera + Filter: Canon EOS Rebel T3 1100D (modified) + Triad Tri-Band or IDAS-LPS-D1 or STC Duo-Narrowband Filter
Software: PHD2; BYEOS; PixInsight; Starnet++ My AP website www.steveking.pictures

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