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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 12 Sep 2013 (Thursday) 20:50
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Gaps in star trails

 
shutterbugcrazy
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Sep 12, 2013 20:50 |  #1

Not sure why there were gaps hopefully someone can tell me what went wrong I'd like to try again

my settings
EOS 40D
TC-80N3 pressed and locked
ISO 1600
25 seconds
f 2.8
24mm
long exp noise reduction OFF
high ISO noise reduction OFF
Continuous drive mode
49 images


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rent
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Sep 12, 2013 21:37 |  #2

I am not certain about why this happens, but it does appear to be a normal phenomenon with stacked images processed in Lighten blending mode. This does not appear to be related to if there's a delay between shots.

In any case, try StarStaX's gap-filling mode and see if that helps.

Btw, I counted only ten segments in this shot. It's even more curious if this is stacked from 49 images.

-alex


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shutterbugcrazy
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Sep 12, 2013 21:56 |  #3

I did try gap filling in StarStaX with same result and I opened all 49 images (jpg saved from raw) and added them into the program and that was the result.


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shutterbugcrazy
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Sep 12, 2013 22:02 |  #4

I went into my folder where I saved my raw to jpg and realized every sixth image is not there but those images are in my original camera download folder. This explains the gaps but why did bridge leave out every sixth??


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troypiggo
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Sep 13, 2013 04:25 |  #5

Check out Star Tracer (external link). Not free ($35) but looks like it may work for you.

Refer also my post on astro software: https://photography-on-the.net …php?p=8874419#p​ost8874419


"Interesting. You're afraid of insects and women. Ladybugs must render you catatonic." - Sheldon
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doidinho
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Sep 15, 2013 12:13 |  #6

The gaps are caused by the delay between shots. Normally you want to have the shortest delay possible to reduce the gaps. A delay of 1 second is typically the shortest delay possible using an intervalometer; this creates gaps, but they are very small. Did you have the camera set to take continuous pictures? I know you had the remote pressed and locked, but in the camera menu was it set to take continuous shots? If so, you may have been getting a 2.8 second delay.


Read the fourth row down in the timer mode combinations table, that is the setting you want to use to get the shortest interval and reduce the gaps.

http://www.learn.usa.c​anon.com …LC_TC-80N3_QuickGuide.pdf (external link)


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spotz04
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Sep 15, 2013 16:50 as a reply to  @ doidinho's post |  #7

^^^ agree about delay between shots.

Startrails.exe (free) may close up those gaps well enough using "Lighten-Screen-Blend" option.

http://www.startrails.​de/html/software.html (external link)




  
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topdslrs
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Sep 16, 2013 21:38 |  #8

What would happen if you kept the shutter open? Sorry I'm a newbie in astro photography.


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spotz04
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Sep 16, 2013 23:10 |  #9

topdslrs wrote in post #16302439 (external link)
What would happen if you kept the shutter open? Sorry I'm a newbie in astro photography.

You can do a long exposure but noise will add up more. Multiple short exposures reduces that noise build up.




  
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topdslrs
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Sep 17, 2013 12:48 |  #10

spotz04 wrote in post #16302647 (external link)
You can do a long exposure but noise will add up more. Multiple short exposures reduces that noise build up.

I wonder how Hubble does it :)


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spotz04
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Sep 17, 2013 19:19 |  #11

topdslrs wrote in post #16304112 (external link)
I wonder how Hubble does it :)

"The two high responsivity and very low noise output amplifiers, typically ~2.5 e-rms at 50kHz, on each sensor, enable imaging of feint objects."

http://www.e2v.com …ability-than-ever-before/ (external link)




  
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Gaps in star trails
FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
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