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03-19-2010, 04:52 PM   #16
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QuoteOriginally posted by johnmflores Quote
Excellent as always!

Quick question - what's the limiting factor in the altitude? Sounds like the balloon popped. Was it thermal stress or something exotic like outer space particle or radiation?
Thanks. Yes, these are Kaymont weather balloons and are designed to burst when they reach a certain diameter. The pressure difference causes them to expand. You can't get a balloon much higher than 120k ft. since the atmosphere at that level is so thin. Think about releasing a ball under water. It will keep rising until it reaches the top, and there is no more buoyancy to lift it. If our balloons were not designed to burst, they would "float" until the sun degraded the latex. We have a remote cut-down system just in case it doesn't burst.

QuoteOriginally posted by jjdgti Quote
Thanks for the response. Did you use some kind of time lapse to take the pictures? Or it was controlled by a PC on the ground and one device on the camera?

Did the lens was exposed to any moisture? A WR lens would be more appropriated?
We use a Pclix lt100 to do the time lapse. The lens is exposed to the atmosphere. I don't think a WR is necessary since condensation on the descent would not be reduced. If it were sealed, the pressure difference may blow the seals out.

QuoteOriginally posted by jbinpg Quote
I would love to see you launch a 21Ltd glued to f8 on the next launch!!
Are you using Totex 800 gram balloons, btw?
We are using Kaymont 3000g balloons. 21mm would be ok, but f/8 may be a problem if you want to keep ISO low. The biggest problem with exposure and maintaining sharpness is not aperture. The biggest problem is motion. If you could see the payloads swinging and spinning around during the flight, you would see what I mean. A fast shutter is extremely important. Even 1/3000s is sometimes too slow. For this flight I set to 1/4000s which is as fast as the k10d can go. The second biggest issue with sharpness is atmospheric "seeing" conditions, similar to issues in astronomy. The conditions were quite poor yesterday with stratified haze all the way up. You can see the layers in the high altitude pictures from yesterday. The Tamron at f/2.8 is sharper than many lenses stopped down, so you would see little effect of stopping down the aperture since the other issues above dominate the sharpness.


Last edited by PentaxPoke; 03-19-2010 at 05:06 PM.
03-19-2010, 04:59 PM   #17
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Another outstanding series PP, you are one of my heros!

Ray
03-19-2010, 06:10 PM   #18
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Very very cool!!

Bravo
I love the peak altitude ones!!
03-19-2010, 07:28 PM   #19
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This is the coolest thing I have ever seen. What a great idea!

03-19-2010, 07:51 PM   #20
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Another excellent series. Thanks for sharing.
03-19-2010, 07:55 PM   #21
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QuoteOriginally posted by PeteyJ Quote
This is the coolest thing I have ever seen. What a great idea!
Check out his avitar Petey, here is a better image of it.

https://www.pentaxforums.com/forums/pentax-dslr-discussion/43930-pentax-k10d-space-ii.html
03-19-2010, 09:55 PM   #22
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way too cool!
03-19-2010, 10:11 PM   #23
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Space

Hi all,
use to launch model rockets,record sound and determine velocity by doppler shift.
how times have changed.
Great job folks, this is the kind of thing I want my kids to see.

03-19-2010, 11:30 PM   #24
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*bow down*


great job.
03-26-2010, 08:20 AM   #25
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You should be using a Canon P&S for these though. Then you'd be hitting the international news like this guy....

Million Dollar NASA Photos Beaten by Budget Balloon

British aerospace enthusiast takes NASA-style photographs using a helium balloon and a pocket camera | Mail Online

Pictures From Above - West Yorkshire Uk

and on MSNBC... http://www.msnbc.msn.com/id/3032619/vp/36043526#36043526

Mike
03-26-2010, 08:43 AM   #26
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You beat me to it Mike - I was going to write about this guy - I live in West Yorkshire and he was on local breakfast TV yesterday!
04-01-2010, 08:21 PM   #27
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QuoteOriginally posted by flyer Quote
It could well be, but this could be overcome with a simple pressure release valve. There must be some other practical reason to have the balloon popping around that altitude.
For the sake of argument let's consider that PentaxPoke did not give the actual reason so I can post the wise-ass response:

So he can get his camera back!
04-01-2010, 08:22 PM   #28
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And in all seriousness:

GREAT shots. My hats off to you for the ingenuity.
04-02-2010, 05:53 AM   #29
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Ascending K10D....

These projects excite my imagination and questions pop into my mind...I was wondering that if the balloon had a pressure relief valve fitted, what would be the maximum theoretical height it could reach ?? Thanks for a wonderful series,,,
04-02-2010, 06:46 AM   #30
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QuoteOriginally posted by Daveinozbikes Quote
These projects excite my imagination and questions pop into my mind...I was wondering that if the balloon had a pressure relief valve fitted, what would be the maximum theoretical height it could reach ?? Thanks for a wonderful series,,,
If it got high enough, you might as well ask the folks at the ISS to grab it!
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