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High Altitude Balloon

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Offline BHPete

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High Altitude Balloon
« on: 25 / November / 2009, 18:44:13 »
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I know these have popped up around here from time to time...  On November 23, 2009 a friend and I launched a balloon to 100,000' with a CHDK equipped Canon A570 onboard.  We got some pretty good pix.





We had some over-exposure issues but will try to adjust for that on future flights.  I'd appreciate any suggestions for scripting that will acount for the large variation in light on these high altitude flights.

A photobucket slideshow of the pix can be seen here http://s33.photobucket.com/albums/d94/bigheadpete/NIXHAB-3/?albumview=slideshow

Criticism welcome!

Pete
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Offline reyalp

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Re: High Altitude Balloon
« Reply #1 on: 25 / November / 2009, 21:59:52 »
Awesome.  :D
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Offline fe50

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Re: High Altitude Balloon
« Reply #2 on: 26 / November / 2009, 01:36:22 »
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Offline Old Farseeing Art

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Re: High Altitude Balloon
« Reply #3 on: 27 / November / 2009, 22:55:44 »
Very nice shots.  As far as exposure, see fbonomi's contributions; he solved those issues a while back.
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Offline Sasha

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Re: High Altitude Balloon
« Reply #4 on: 05 / December / 2009, 15:05:57 »
Stunning, so stunning! It's like having a trip to sub-orbit.
How many kilometers are 100,000'?

Do you have similiar shots from the same height, that could be used as stereo pairs?
Seeing clouds in 3D from above must be amazing... http://www.flickr.com/photos/stereotron/
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Offline peabody

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Re: High Altitude Balloon
« Reply #5 on: 07 / December / 2009, 10:03:42 »
This may have been addressed before, but I'm a bit surprised the A570, or its batteries,  would operate at what I assume were very low temperatures.  Do you have a low temp reading from this flight, or a feel for what it may have been?

Anyway, congratulations on the successful mission and these wonderful shots.
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Offline fbonomi

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Re: High Altitude Balloon
« Reply #6 on: 07 / December / 2009, 12:36:50 »
« Last Edit: 07 / December / 2009, 12:38:27 by fbonomi »
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Offline BHPete

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Re: High Altitude Balloon
« Reply #7 on: 07 / December / 2009, 13:49:09 »
Good questions.

100,000 feet equals 30.48 km!  

It is very cold up there.  CHDK equipped Canons have flown many high altitude flights.  Our flight was in a Styrofoam cooler with a 2.5" hole drilled in the side.  Cold certainly is a factor but doesn't seem to affect the Canon.  I did use Energizer lithium batteries that work well in the cold.

Stereo pics.  I hadn't considered it.  I do have another A570 as a spare.  How far apart would they need to be for a good stereoscopic effect?  That might be an issue...

Edit:  In looking at Sacha's 3D Flickr pages I see the stereo baseline for some of the photos is measured in meters.  I am wondering how well this would work from high altitude.  I am intrigued but have many questions on making it work....
« Last Edit: 07 / December / 2009, 14:45:40 by BHPete »
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Offline fbonomi

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Re: High Altitude Balloon
« Reply #8 on: 07 / December / 2009, 15:56:47 »
Quote from: BHPete on 07 / December / 2009, 13:49:09
Edit:  In looking at Sacha's 3D Flickr pages I see the stereo baseline for some of the photos is measured in meters.  I am wondering how well this would work from high altitude.  I am intrigued but have many questions on making it work....

The baseline must be "not insignificant" in respect to the distance of the object being photographed.

In this case, clouds are a few kilometers away, so very large baselines would be needed to have some 3d effect.

Some grund-based experiments could be made, but I guess that a baseline of a few hundred meters is the minimum to get some parallax on clouds that are 20-30 kms away...
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Offline BHPete

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Re: High Altitude Balloon
« Reply #9 on: 07 / December / 2009, 20:23:14 »
"Not insignificant" is the operator here.  I doubt I could make that work.  It would be cool to do but seems not to be possible  - at least for an amateur like me!

Thanks for the input.

These photos give a better idea of the payload package and the constraints on size:





« Last Edit: 07 / December / 2009, 20:27:01 by BHPete »
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