night sky timelapse video with shutter speed override - Script Writing - CHDK Forum

night sky timelapse video with shutter speed override

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Offline mx3

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night sky timelapse video with shutter speed override
« on: 08 / January / 2008, 03:10:10 »
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I'm playing with timelapse video just now

I made one timelapse video with duration of 12 hours ( 06:00 - 18:00 ) shoot every 15 seconds
quite spectacular :-)
I liked falling stars, ghost automobiles and crows crawling on building construction site like ants

I had at least 9 days of cloudless weather
I would like to make night sky with moving stars and automobiles moving
but all shoots i could manage where dark

I'm not a photographer and don't know if native functionality of camera can do this (I own a630).
I have checked shutter override ~40-60 seconds (manual press on shot button).
it looks like it is what I want but it does not work in interval script
i used following script

Code: [Select]
@title Interval script
@param a Shoot count(*1000)
@default a 20
@param b pause (seconds)
@default b 10

sleep 1000

if a<1 then let a=10
if b<1 then let b=1
let b=b*1000
let a=a*1000

for s=1 to a
  shoot
sleep b
next s
end

what I'm missing?
have I to switch to some mode? (I made it in auto :-) )
have I to check/uncheck something in alt menu?
have I to add some code into script?




skype: max_dtc. ICQ: 125985663, email: win.drivers(at)gmail, eVB decompiler

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Offline mx3

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Re: night sky timelapse video with shutter speed override
« Reply #1 on: 08 / January / 2008, 03:34:09 »
It seems setting up above mentioned script with static shutter speed override will give overexposed images all the time but night

I have some funny ideas to extend time-lapse video script by adding into it motion detection feature

1) it is possible to get overall luminosity value from LCD so script can adjust shutter speed override value based on overall light intensity (I'm not sure. is there an other way to do this?)

2) instead of using of "sleep" command it is possible to use md_detect_motion, to catch some additional "time freeze" shots

of course there is still a problem with LCD switched on ( battery drain )
I have not checked if CHDK can switch on/of LCD using basic command

 
skype: max_dtc. ICQ: 125985663, email: win.drivers(at)gmail, eVB decompiler

Re: night sky timelapse video with shutter speed override
« Reply #2 on: 08 / January / 2008, 05:07:55 »
@ mx3

Would You plz upload your time lapse video or any one of the long exposure sky pics... ALso which cam do u have?

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Offline mx3

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Re: night sky timelapse video with shutter speed override
« Reply #3 on: 08 / January / 2008, 05:13:54 »
Where to upload video ?
I have one 4mb (2-3 hours) 640x480
and one set ( 1600x1200 . 06:00-18:00 ) with two compilations : 8mb and 35 mb
I forget to copy videos to my flash drive so I will not be able to upload them some hours anyway

I have a630 camera

I did not make high exposure sky videos yet
I'm searching for options to do it
« Last Edit: 08 / January / 2008, 05:16:41 by mx3 »
skype: max_dtc. ICQ: 125985663, email: win.drivers(at)gmail, eVB decompiler


Re: night sky timelapse video with shutter speed override
« Reply #4 on: 08 / January / 2008, 05:15:32 »
www.speedyshare.com

Another thing... With upto 65 sec exposure and the camera pointed towards the night sky... are we able to capture the stars or shooting stars if any on the pic....
Cause i tried that with 15 sec before CHDK and all i got was a blank pic without any stars...
« Last Edit: 08 / January / 2008, 05:19:47 by analogx »

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Offline mx3

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Re: night sky timelapse video with shutter speed override
« Reply #5 on: 08 / January / 2008, 05:58:47 »
I managed to get files from my home computer

4mb first file: http://www3.speedyshare.com/data/873348142/8390928/25492722/mx3_20080105.AVI
and second 8mb with bad compression http://www3.speedyshare.com/data/480472574/8391039/7527561/mx3_20080106.avi

can't upload hi-res 35 mb file.
there is 30 mb limit.
anyway I think You do not need it
skype: max_dtc. ICQ: 125985663, email: win.drivers(at)gmail, eVB decompiler

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Offline DDMan

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Re: night sky timelapse video with shutter speed override
« Reply #6 on: 08 / January / 2008, 09:33:19 »
Hi mx3,

why don't you try http://www.zshare.net/ like many users here. They have a 100 MB limit but that should be enough.  :D

Greetz
A720 IS Firmware 1.00c

Re: night sky timelapse video with shutter speed override
« Reply #7 on: 08 / January / 2008, 13:11:41 »
Deleted
« Last Edit: 22 / April / 2008, 09:27:56 by Barney Fife »
[acseven/admin commented out: please refrain from more direct offensive language to any user. FW complaints to me] I felt it imperative to withdraw my TOTAL participation. Nobody has my permission, nor the right, to reinstate MY posts. Make-do with my quoted text in others' replies only. Bye


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Offline PhyrePhoX

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Re: night sky timelapse video with shutter speed override
« Reply #8 on: 09 / January / 2008, 02:59:31 »
when you take a 65 second photograph of the nightsky, wouldnt the stars somehow begin to smear a little because of the revolution of the earth (i aint not astronomist though)? i got one or two pics of the moon @ 65 seconds and it is "smeared" on both of them.
unfortunately i cannot shoot the stars because i live in such a bright city (light pollution) :(

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Offline mx3

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Re: night sky timelapse video with shutter speed override
« Reply #9 on: 09 / January / 2008, 03:29:27 »
when you take a 65 second photograph of the nightsky, wouldnt the stars somehow begin to smear a little because of the revolution of the earth (i aint not astronomist though)? i got one or two pics of the moon @ 65 seconds and it is "smeared" on both of them.

it is exactly what I would like to have
I make video anyway

only problem is how to make long exposure shot in script
skype: max_dtc. ICQ: 125985663, email: win.drivers(at)gmail, eVB decompiler

 

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