Live Stack March 6 & 7 2019

A place to share images that you have taken with SharpCap.
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Please upload large images to photo sharing sites (flickr, etc) rather than trying to upload them as forum attachments.

Please share the equipment used and if possible camera settings to help others.
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BlackWikkett
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Live Stack March 6 & 7 2019

Post by BlackWikkett » Sat Mar 09, 2019 2:53 am

Been a while since I've posted some live stack results. Here's the latest effort from a few nights ago. All images captured via SC live stacking and saved as seen. This generates an 8 bit PNG image that I ran through Photoshop 2019 for color balance and a touch noise reduction.

Equipment:
RC 6 FL 1370 F/9, ZWO ASI183MC Pro, cooler at -15c, IDAS D1 LPS filter, using flat and dark master.
Used bin 2 to arrive at image scale .72 arcsec/pixel. If you follow link to Flicker you'll see capture details for each image.

ImageM63 Sunflower Galaxy PS Edit Stack_53frames_6360s_WithDisplayStretch by Black Wikkett, on Flickr

ImageM51 Whirlpool Galaxy PS Edit Stack_45frames_5400s_WithDisplayStretch by Black Wikkett, on Flickr

ImageM13 Globular Cluster PS Edit Stack_12frames_1440s_WithDisplayStretch by Black Wikkett, on Flickr

ImageM57 Ring Nebula PS Edit Stack_13frames_780s_WithDisplayStretch by Black Wikkett, on Flickr

Thanks for having a look. -Wikkett

AndyBooth
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Joined: Thu Mar 01, 2018 6:55 pm

Re: Live Stack March 6 & 7 2019

Post by AndyBooth » Sat Mar 09, 2019 8:19 am

Great shots!
Are you saying these are binned x2, using a colour camera?
I thought that binning destroyed the bayer colour info on an osc camera,
Or am i being thick :roll:

BlackWikkett
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Re: Live Stack March 6 & 7 2019

Post by BlackWikkett » Sat Mar 09, 2019 3:50 pm

Bin 2 and color is intact.

AndyBooth
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Re: Live Stack March 6 & 7 2019

Post by AndyBooth » Sat Mar 09, 2019 4:07 pm

I’ll have to have a go at that!
Thanks

BlackWikkett
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Re: Live Stack March 6 & 7 2019

Post by BlackWikkett » Sat Mar 09, 2019 4:20 pm

I can elaborate a little with my limited understanding.

Normal one shot color pixel

RG
GB

Bin2 OSC pixel ( something like this not 100% on this )

RGRG
GBGB


The normal bin 1 resolution of the camera is 5496 x 3672 at bin 2 2744 x 1836. The images posted are less than this. I forgot to mention in the original post that dithering is applied every 4 frames. This causes a significant border fringing (not sure what to call it but it's ugly) that was cropped out of final image.

AndyBooth
Posts: 46
Joined: Thu Mar 01, 2018 6:55 pm

Re: Live Stack March 6 & 7 2019

Post by AndyBooth » Sat Mar 09, 2019 6:13 pm

Ah right,
I understand.
And dithering is mandatory I feel to get rid of ‘colour mottle’ noise.
Certainly all working well for you 👍🏻

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turfpit
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Re: Live Stack March 6 & 7 2019

Post by turfpit » Sun Mar 10, 2019 11:14 am

The links below contain useful background information on binning.

viewtopic.php?f=35&t=262

https://www.swagastro.com/to-bin-or-not-to-bin.html

Dave

AndyBooth
Posts: 46
Joined: Thu Mar 01, 2018 6:55 pm

Re: Live Stack March 6 & 7 2019

Post by AndyBooth » Sun Mar 10, 2019 2:40 pm

thanks Dave, good links indeed.😀

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