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Old 01-04-2020, 01:47 PM
LtChestnut (Chester)
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Best practice for untracked Dob imaging (and autostakkert help)

Just got a new si 120mc-s, and tried to get a lunar shot last night with my 6inch dob. At 1200mm focal its too zoomed in so if i want to capture a full disk I need to create a mosaic in photoshop. What is the best way to do this?

Last night I tried to let the moon drift across the screen 3 times, with the plan being to stack each video and then align the 3 images in photoshop. If youre confused what I mean, this is the start vs end of the 3rd video https://i.imgur.com/iNjerg3.png and https://i.imgur.com/tc4L8hH.png.

That worked for the first 2 videos but not the 3rd. And for the 2 first videos, there were some stacking artefacts that looked really nasty with sharpening.

Video 1 stack = https://i.imgur.com/12XMAtt.png

Video 2 stack = https://i.imgur.com/gSY4jiz.png

Thos ones stacked fine, but when I went to stack the 3rd I kept getting really bad miss stacks. like this https://i.imgur.com/TkusPLY.png No matter what settings I tried I always got bad stacks with 3, and the patterns were consistent. Out of curiosity, I 'stacked' (select 1 frame in autostakkert) the first frame to see if it had corrupted and this was the result https://i.imgur.com/A9nWrdg.png


After seeing that I then rejected the first 10 frames but still had the same error. And then after that I went a cut the first 10s of the video off but that also had the same problem. The only thing that seemed to change how good the stacking was, was making less APs and making them larger. This final image was done with 2 APs https://i.imgur.com/gMDlEHX.png


I had a look through that video and couldn't find any massive jumps/corrupted frames. Running through PIPP doesn't work because it crops and registax just gives a worse result.


If anyone has any ideas what happened with that 3rd video and how I can avoid it, that would be greatly appreciated. If there is a better way to do this sort of imaging, please tell me! I would also like to be able to remove the stacking artifacts in 1 and 2.
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Old 01-04-2020, 02:44 PM
sharkbite
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Hi chester...

I had a similar setup when I had an 8inch dob and a dslr

The moon is so bright you can take nice crisp shots
With a very high shutter speed.

I have had good results taking many individual jpgs and stitching them together in Microsoft ICE.

I found about 10 jpgs did the trick with the big sensor
.....you might have to take a few more...

MICE is pretty smart...i tried both letting the moon travel through the fov
And also random single shots from all over the moons face.
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Last edited by sharkbite; 01-04-2020 at 02:56 PM.
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Old 01-04-2020, 03:51 PM
LtChestnut (Chester)
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Ive heard good things about ICE, will have to check it out. Still doesnt solve the issue of stacking though... :/
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Old 01-04-2020, 08:14 PM
sharkbite
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...but you don't need stacking....

My shot was the result of stitching together 10ish slightly overlapping single shots.
Since my dob was also 1200mm fl you would get the same result using the same DSLR.
Since your 120 has a much smaller sensor you will need to take more shots.
(Don't ask me how many!)

Skip the video step altogether and just capture heaps of jpgs

MICE will do the rest.....

Last edited by sharkbite; 01-04-2020 at 08:34 PM.
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