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Timelapse with variable shutter speed

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Offline fbonomi

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Re: Timelapse with variable shutter speed
« Reply #60 on: 15 / May / 2008, 03:27:37 »
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Quote from: fpalangie on 14 / May / 2008, 16:29:07
During 5 hours there is a lot of luminosity change in the end due to this my pictures have more and more noise to them.

What time did you start, and what time did you end?
I guess it ends pretty late at night....

Quite nice video, and the motion of clouds in two different directions is great

I would say 20 secs. is too long as an interval , as the clouds' motion is no longer fluid, but I know that with batteries, you can't get more than that... if you shoot more frequently you won't have 5 hours of life !

When you'll get the power adaptor it will help in that. I was thinking about one too, but then I'd constrained by AC availability, and I think being free to select locations is a must for nice timelapses.
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Offline whim

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Re: Timelapse with variable shutter speed
« Reply #61 on: 15 / May / 2008, 03:38:22 »
Quote
When you'll get the power adaptor it will help in that. I was thinking about one too, but then I'd constrained by AC availability, and I think being free to select locations is a must for nice timelapses.

You could probably get a small lead battery (7-10 Ah, size comparable to motorcycle battery) for less than the
price of a Canon adapter and rig up a power supply with that

wim
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Offline fpalangie

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Re: Timelapse with variable shutter speed
« Reply #62 on: 15 / May / 2008, 03:41:40 »
In fact the timelapse is taken between roughly 13h and 19h. I think I will give it another shot today as I should receive the AC adapter this morning and this time i will take a shot every 10 sec or maybe 5 sec because the waves seem very chopped up.

Concerning the script (sorry but i am not really a programmer) my understanding is that from one shot to another it is assumed that luminosity will be equivalent or go down. This is why my shot start having noise since the ISO goes down and luminosity comes back higher due to the moving clouds... am I right?

Oh and i found a very small software to build the time lapse go check it out at http://home.hccnet.nl/s.vd.palen/  it is called photolapse, only 152Kb, works like a charm.
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Offline fbonomi

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Re: Timelapse with variable shutter speed
« Reply #63 on: 15 / May / 2008, 09:17:37 »
Quote from: whim on 15 / May / 2008, 03:38:22
You could probably get a small lead battery (7-10 Ah, size comparable to motorcycle battery) for less than theprice of a Canon adapter and rig up a power supply with that

Yes, that's the lines I am following (motorcycle battery regulated with a LM317).
I just haven't had time to work with it (or on the script, btw) lately.




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Offline fpalangie

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Re: Timelapse with variable shutter speed
« Reply #64 on: 15 / May / 2008, 15:32:46 »

Okay as promised i received my AC adapter so here is a wonderful day for you to see:

Changing Day TimeLapse on Flickr - Photo Sharing!

Sorry for the spec due to the unclean window...
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Offline PhyrePhoX

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Re: Timelapse with variable shutter speed
« Reply #65 on: 15 / May / 2008, 15:36:38 »
wow, simply amazing.
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Offline vine

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Re: Timelapse with variable shutter speed
« Reply #66 on: 15 / May / 2008, 18:37:53 »
I envy you for such a beautiful view. All I see out of my window are ugly gray buildings :(
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Offline fbonomi

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Re: Timelapse with variable shutter speed
« Reply #67 on: 17 / May / 2008, 03:30:56 »
fpfalangie, VERY beautiful!
the changing weather makes it even more interesting.
But now that you have the adaptor, let it run longer in the night!

In the meanwhile, I have been working on the "dawn" version of the script (based on the custom build I was discussing),  it's a bit more complex than I originally thought.

I have the first dawn timelapse here:

http://francescobonomi.blip.tv/file/913952/

It was a very cloudy night (in effects it even started raining) but it was just to test the script.

It kind of works, you have a strong "flash" at about 5" when the script passes from "night exposure" method to the standard camera one.

I will have to interpolate the two.

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Offline fbonomi

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Re: Timelapse with variable shutter speed
« Reply #68 on: 17 / May / 2008, 04:50:06 »
This is the exposure graph for the video.

you can clearly see the flash :-(

the red line is the sensed value I read from the last shot and us to correct exposition when in "guess mode".

its main uses are:

1) avoid over-exposing the night sky
2) slowly decrease the exposure up when luminosity grows

As you see from the graph, the "slowly" bit is not yet very good :-)
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Offline fpalangie

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Re: Timelapse with variable shutter speed
« Reply #69 on: 17 / May / 2008, 12:25:41 »


Well fbonomi when you get something close to working i will be willing to test...
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