highaltitude.log.20080529

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[00:37] <Laurenceb> anyone here know anything about mutual information?
[00:39] <Laurenceb> I have two bitstreams - in and out of a channel, P of a bit being flipped=2/15 , whats the mutual information between the two?
[01:04] <natrium42> lol, fail --> http://science.slashdot.org/comments.pl?sid=566217&threshold=1&commentsort=0&mode=thread&cid=23569921
[01:05] <natrium42> or a good joke :D
[01:56] <akawaka> hah
[01:57] <akawaka> reminds me we need to buy a parachute
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[12:29] <edmoore_> morning all
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[16:34] <natrium42> edmoore!!11eleven
[16:44] <natrium42> edmoore?
[16:55] <edmoore> natrium42:
[16:55] <edmoore> yo
[16:56] <edmoore> sorry was getting a coffee
[16:57] <natrium42> edmoore, op yourself!
[16:58] <natrium42> so what's up?
[16:58] <edmoore> how do I?
[16:58] <natrium42> dunno :)
[17:00] <natrium42> edmoore, what magnification do you think is required to track a balloon?
[17:00] <edmoore> !op
[17:00] <edmoore> I've no idea.... but i think I might be able to find a data point. will look up the spec of what we used last flight
[17:01] <natrium42> ok, cool
[17:02] <natrium42> i wonder if something like this would work --> http://cgi.ebay.ca/500mm-ED-Telephoto-Lens-f-Canon-EOS-5D-10D-20D-30D-40D_W0QQitemZ350063633696QQihZ022QQcategoryZ106844QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[17:03] <edmoore> almost certainly
[17:03] <edmoore> especially if you have a high res sensor
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[17:03] <natrium42> well, mine is 6MP
[17:04] <edmoore> ]can't find the info on that scope, sorry
[17:04] <natrium42> here's a similar one --> http://www.pbase.com/dang/500
[17:04] <natrium42> not sure about it being so cheap
[17:04] <natrium42> usually telephoto lenses are in the >$1k range
[17:14] <natrium42> O_O ---> http://cgi.ebay.ca/Sigma-800mm-F5-6-Super-Telephoto-APO-DG-Lens-for-Canon_W0QQitemZ230255172638QQihZ013QQcategoryZ106844QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[17:14] <edmoore> natrium42: have used that one before
[17:14] <edmoore> the reason it is cheap is ebcause it is crap
[17:14] <natrium42> yah
[17:14] <edmoore> but not in *that* bad a way
[17:15] <natrium42> you get what you pay for (especially with lenses)
[17:15] <edmoore> it has what in normal terms would be a fairly crap min aperture of f/8, but that's not really an issue for you as you will only be using it on fairly big bright clear skies
[17:15] <natrium42> 300mm is probably enough for my purposes
[17:15] <edmoore> so plenty of light
[17:15] <natrium42> right
[17:16] <natrium42> although the object is far away
[17:16] <natrium42> so there's less light with high magnification
[17:16] <edmoore> i mean the construction quality won't be up to usual either, but you're not a pro using it every day - basically I think the sacrifices it makes probably are in ways that do not affect the intended ap
[17:16] <edmoore> making it perhaps quite a good buy
[17:17] <edmoore> well, that's true, but as i say, if there's any situation where that is going to affect you in the least bad way, it's probably tracking a bright balloon in an open sky
[17:17] <natrium42> right
[17:18] <natrium42> $70 is not too much to waste on a single-purpose object
[17:20] <edmoore> yeah - and you can have fun with it anyway
[17:20] <edmoore> with other stuff
[17:20] <natrium42> then again i do like high quality :/
[17:20] <natrium42> and i probably will have many uses for a high quality telephoto lens
[17:20] <Akadecca> and so it begins
[17:21] <natrium42> decisions, decisions....
[17:21] <edmoore> well yeah there is the old photography dictum - buy right, buy once
[17:21] <natrium42> so true
[17:23] <Akadecca> my ebay dictum seems to be: buy wrong, buy wrong, buy wrong, fuck it, buy right
[17:23] <natrium42> haha, also true
[17:26] <edmoore> :)
[17:26] <edmoore> oh oh oh
[17:26] <edmoore> casio ex+f1
[17:27] <edmoore> google, take a look at the vids on edgagenet
[17:27] <natrium42> is it the 1200fps one?
[17:27] <edmoore> imagine having on of them on a payload, using the 'capture after' feature to get the balloon bursting at 1200fps
[17:27] <edmoore> yeah
[17:27] <edmoore> I reaaaaaaally want to get one
[17:27] <natrium42> hehe, it's pretty interesting
[17:27] <edmoore> especially for our rockoon
[17:27] <natrium42> quality is not great, but the fps capability is awesome for a few limited uses
[17:29] <natrium42> another thing i need is a motorized scope mount for the camera
[17:30] <natrium42> edmoore, what do you think about something like this? http://www.khanscope.com/productdetails.cfm?productID=1661
[17:31] <natrium42> no need for telephoto lens
[17:31] <natrium42> just attach the camera to it
[17:31] <edmoore> I so so so so want a Meade....
[17:31] <edmoore> The local photography place on the high-street has a meade 12"
[17:31] <edmoore> i walk by whenever i can... it's so cool
[17:31] <natrium42> hehe, they are nice :)
[17:31] <edmoore> so yeah, you needn't sell the idea to me :)
[17:32] <edmoore> am sold already
[17:32] <natrium42> do you see any problems using it as a balloon tracker?
[17:33] <edmoore> so explain to me the concept - you get a visual lock, say, with a webcam, and use a tracking algorithm to keep tracking it?
[17:33] <natrium42> yes, you can also get the position from gps (corrected for velocity)
[17:35] <natrium42> optical tracking is pretty easy
[17:35] <natrium42> two concerns is speed & precision of the tracking mechanism
[17:37] <natrium42> i could test it on airliners :D
[17:40] <edmoore> :)
[17:40] <edmoore> that would be awesome
[17:41] <edmoore> yeah, I had always planned on going gps for our one
[17:41] <edmoore> but optical would be great
[17:41] <edmoore> also, you could stick a crude radar on it
[17:41] <edmoore> so you would have orientation and ranging
[17:41] <edmoore> so if you lost telem, you could still track it
[17:42] <natrium42> lidar!
[17:43] <edmoore> how cool would that be!!
[17:43] <natrium42> pretty cool
[17:43] <natrium42> but
[17:44] <edmoore> exactly.
[17:44] <natrium42> i don't kow where to get one
[17:44] <natrium42> *know
[17:44] <Akadecca> natrium42: just set up your tripod near a local runway
[17:44] <natrium42> yah
[17:45] <Akadecca> i wonder how difficult it would be to make a radar
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[17:46] <Hiena> Good evening!
[17:46] <natrium42> maybe it would be easier to do ranging based on signal strength from a transmitter
[17:46] <natrium42> hi hiena
[17:46] <natrium42> http://cgi.ebay.ca/VIGIL-COMPLETE-MARINE-RADAR-ASSEMBLY_W0QQitemZ310053044247QQihZ021QQcategoryZ31276QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[17:46] <natrium42> marine radar, hmm
[17:46] <Akadecca> i'd be worried that orientation would have more of an affect on signal strength than distance
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[17:48] <natrium42> right, that could be a problem
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[21:52] <edmoore> busy here this eve
[21:53] <akawaka> sssshh
[21:54] <akawaka> we're thinking
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[21:55] <akawaka> http://www.dinosaursandrobots.com/2008/05/icbm-guidance-panel-found-at-surplus.html
[21:55] <akawaka> need one of those for balloon stuff
[21:58] <natrium42> lol
[22:00] <Laurenceb> looks like something from a physics lab
[22:01] <Laurenceb> I found a 1950s multimeter that looks just like that countdown clock in a storeroom here
[22:10] <hyperb> nice
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[23:05] <akawaka> happiness is....a box of stuff from digikey
[23:13] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) left irc:
[23:22] <akawaka> okay, time to write a decent cross platform network clipboard
[23:54] Action: Laurenceb has many boxes
[23:55] <Laurenceb> therefor I thould be very happy.... sadly no
[00:00] --- Fri May 30 2008