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Saturn May 6th (With DSLR) [with question]

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#1 luigis

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Posted 06 May 2013 - 05:06 PM

Hi all,

Seeing was quite bad. I took 4/5 minute videos with my T2i in movie-crop mode using a 5'' Mak-Cass scope and a 4x barlow (F44).

Frames stacked with Autostacker! then wavelets with Registax and final minor touches with Ps or Gimp.

For the Moons I took an additional exposure of 2.5 seconds at ISO12800 and then combined the frame with the Moons with the image of the planet from the videos. I took 4/6 exposures to make sure I don't confuse noise with a Moon.

Titan is on the left, then Enceladus, Dione and Thetys with Rhea on the right. Below Saturn I got either a very dim Mimas or just an artifact. I think I also got Iapetus far left from Titan but didn't include it in the final image because it was too dim. It will get brighter at the end of May and then I can be sure it's there and not a small star or artifact.

I'm including a single frame from the video to show how it looked.

Posted Image

Posted Image

Posted Image

I'm wondering if I can do better with my small scope. I'm still not sure about how many frames would be better to stack and how long the video. Can you give me ideas? Thanks!

Luis

#2 Tom and Beth

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Posted 06 May 2013 - 05:27 PM

Ya know, Luis, that is one of the better images I've seen of Saturn. You seem to have caught the Polar Hex in your top picture. I've been lurking in the Planetary group, where the best images seem to come from those using Mono CCD Chips.

As you can tell, I think you're doing a heckuva job, especially since One Shot Color CMOS is considered inferior to the task.

#3 zjc26138

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Posted 06 May 2013 - 05:28 PM

Luis,
That is one fantastic image! It's amazing how good these DSLR's are for planetary imaging.

#4 fco_star

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Posted 06 May 2013 - 08:11 PM

Luis, tus fotos de Saturno son excelentes!

I agree with T&B this are one of the best Saturn pictures I ever seen, I really like the composition with the moons! Great Job!

#5 luigis

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Posted 06 May 2013 - 09:30 PM

Thank you very much guys.

I wonder what would happen if the same method is used with a larger scope like a C14. I also wonder if I can improve this and how much with my small scope.

So many questions so little time...

#6 JohnH

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Posted 06 May 2013 - 09:58 PM

I would say pretty good for a 5" scope.

#7 srosenfraz

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Posted 07 May 2013 - 12:39 AM

Luis, tus fotos de Saturno son excelentes!

I agree with T&B this are one of the best Saturn pictures I ever seen, I really like the composition with the moons! Great Job!


+ Uno!

#8 Jim Chung

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Posted 07 May 2013 - 07:32 AM

Luis,


I am a planetary imager and this is a most excellent result! Not to take anything away from your skill but for the benefit of DSLR forum members who are typically DSO imagers, Luis' image also benefits from being taken in Argentina where Saturn rises quite high in the night sky and improves seeing conditions significantly.

I think that you have probably exploited the maximum resolution of your 5" scope at f/44 (!!!) and its amazing what treasures lie within what looks like terrible raw data.

What ISO were you shooting at? I presume you were using the longest shutter speed allowed (1/60th second). Your excellent results make me wonder if the low noise characteristics of the Canon CMOS sensor allows the DSLR imager to use very high gains/ISO and high f stops without much consequence on image quality. With typical planetary imaging ccds I have a tough time shooting Saturn higher than f/20 without a lot of noise contamination.


regards,


Jim

#9 luigis

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Posted 07 May 2013 - 08:16 AM

Thank you Jim.
You are right, Saturn is really high in the sky from Argentina and that helps.
I shoot at 1/60 ISO6400.

#10 shawnhar

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Posted 07 May 2013 - 08:24 AM

You might squeeze a bit more out of it if you had really good seeing. Obviously you are at the limit of the conditions, the equipment capture and processing is NOT what's holding you back.
That is unreal, you were able to get that from the single frame example you posted, I am going 5 minutes next time!

#11 SunBlack

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Posted 12 May 2013 - 07:21 AM

5'' Mak-Cass ???? BEST image i've seen with a dslr with that kind of scope....






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