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Jupiter 09/06/2018 [DSLR]

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#1 SunBlack

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Posted 09 June 2018 - 06:04 PM

Last night 05/06/2018 at 22.30h LT with a Canon 6D mod, stack of 215 exps from a video 1:1 5x Live View captured by EOS Camera Movie Record , 1/30s 400iso on a Celestron C8. Eyepiece projection with a Celestron zoom 8-24mm set at 16mm. Crop and PP in Registax 2 e Paint Shop X7

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  • out_5a_215xRAW_50-25.jpg

Edited by SunBlack, 10 June 2018 - 10:13 AM.

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#2 AKHalea

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Posted 10 June 2018 - 02:16 PM

Wow! That came out real nice with the GRS taking almost center stage! Well done ..... Anil


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#3 RedLionNJ

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Posted 10 July 2018 - 07:35 PM

That eyepiece doesn't appear to be doing terribly much in the way of increasing the f-ratio.  You may be better off with a 2x or 2.5x Barlow or PowerMate.

 

This is promising, though.  Include more frames in the stack, too.



#4 BQ Octantis

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Posted 12 July 2018 - 10:18 PM

Beautiful color contrast, but the entire disk looks a bit onion-y (which I typically only get on the limb). This comes from not enough dynamic range in the stack, and 215 frames seems like a very low number…have you tried increasing the stack? I typically do 1000 input (Live View .mp4) frames per processed output frame. This is because I can stack 100 seconds of frames without smearing due to planet rotation, and I only get ~10 fps from my Canon T3i through AstroDSLR. The stack is certainly blurrier, but also more tolerant to stronger sharpening methods; I then derotate 2-5 processed frames in Photoshop (so 2000-5000 frames total), which further cleans up any lingering artifacts (e.g., onion, edge-rind, shot noise). The output from my stacker is 16-bits per channel, and I do all processing at 16 bits between Gimp and Photoshop. Are you processing at 16-bits?

 

Separately, you can use a much shorter focal length on Jupiter through an 8" SCT—it's plenty bright,so you can trade some SNR/shot noise for more pixels across the disk. I use orthoscopic eyepieces vice a zoom, and I use the shortest focal length that lets Jupiter practically fill the entire frame at 5x Live View. For my Jupiter shots on 6 July through my 7" Cass-Mak (2700mm f/15), I used a 12.5mm eyepiece. Here's the 1000-frame stack from a 100-second Live-View .mp4:

 

006_unprocessed.jpg

 

which is highly tolerant to sharpening:

 

006_processed.jpg

 

which I then derotated and combined with two other output frames, resharpened, and scaled to acceptable acutance:

 

006-008_derotated.jpg

 

With an 8", you should get at least as many pixels across Jupiter as my 7" (seeing notwithstanding).

 

If you're not happy with the output, you can always scale down; at least then all the artifacts are smaller than the pixel resolution:

 

006-008_scaled.jpg

 

Cheers,

BQ


Edited by BQ Octantis, 12 July 2018 - 10:38 PM.

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#5 SunBlack

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Posted 13 July 2018 - 01:26 AM

in my recent jupiter works posted in this forum i eliminated onion rings artifact



#6 SandyHouTex

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Posted 14 July 2018 - 09:20 AM

That’s an excellent Jupiter pic.  Nice work.




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