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Just wondering, I still have some older 35 mm underwater cameras and was thinking of putting some of Kodaks high speed infrared 35 mm film in it to see what happens. Has anyone else tried infrared in caves? If so, what was the result? Can you even buy it in High Springs/Lake City/Gainesville area?
infrared film is an excellent way to find caves. Some Georgia caves were found by shooting infrared film in the winter from a plane.
is it available in the High Springs area? Its already Saturday and I doubt I'll get to a photo store by the time I fly Monday morning.
Michael,
Harmon’s Photo in Gainesville (a few different locations -- the largest stores being at Westgate Plaza at University Ave. and 34th Street and their Flair Lab south on 34th Street below Archer Road) used to stock black and white infrared film as well as color but that was "in the old days" before digital. I would call them to see but as far as I know that's your best bet for the Gainesville/High Springs area. And if they don't stock it anymore then call B and H in NYC and have them overnight some to you. Let me know how it works out...
Gene Page
I'm guessing that it might be neat in an air-filled cave but everything in an underwater cave would give off IR at nearly the same rate.Quote:
Originally Posted by MichaelAngelo
Just an educated guess though.
Shooting infrared with a normal camera (whether film or digital) does not = thermal IR. That is a totally different animal and requires much more expensive equipment.Quote:
Originally Posted by Kelly Jessop
What you would see with infrared film in a 35mm would be the reflected IR light. NOT the emitted thermal energy.
I've only dabbled with IR photography, but apparently some of the early digital cameras (i.e. Olympus 3040) are very good at capturing IR images. It can result in some very interesting photos, and you just need to add the proper filter.
Marbry
Florida offers there DOQQs in infrared format. However, you can get fooled with coastal karst (been there) but you can find interesting things as well...
Here is a site with a lot of IR photography info.
http://www.wrotniak.net/photo/infrared/
Sorry I didn't put a link up...
www.labins.org
thanks for all the great imfo
I was unable to find the film anywhere. Seems like its out even nYC and Heliex in Chicago. Maybe next trip
MA
You might be interested in this.
http://www.echeng.com/photo/infrared/
This is Eric Cheng- he started wetpixel.
He has a whole section on infrared with digital cameras and filters.
Andrew
This sounds logical to me. I'd love to see someone try it and find out if anything BUT this would result. Though actually, why wouldn't it be true in an airfilled cave as well?? With no sunlight, or any other heat source, how could there be any thermal differences? That is human subjects aside.Quote:
Originally Posted by Gary
And I tend to think in the longwave. I'm not sure if there'd be any effect in the near IR.
I'm gonna post up in the air-filled cavers' forum now. :wink:
For the reflected IR I imagine you'd probably need an IR lamp since you wouldn't have a IR source in a cave.Quote:
Originally Posted by Squirrel Girl
For emitted IR water would be an emitter and with everything at the same temperature that's all you'd get underwater.
Air as a gas I think is too diffuse to act a a major emitter of IR so IR in an air filled cave you should be able to pick up other cavers, any hot blooded animals - maybe even foot and hand print and such. I wouldn't be surprised that a good system could pick up enough temperature variation to pick out different areas of rock - enough to "see" the cave shape.
I have had experience using IR systems in smoke/flame filled building and such. Once again the air is thin. You can see through hot air to the flames or people beyond. You can find people behind curtains etc.
I once found a bunch of videos on the internet can't fand anything good today though.
What he was talking about was not thermal IR. If you really want to do thermal, you can get a handheld thermal IR imaging device much cheaper now, although they're still around $5k.
Photo strobes are excellent sources of IR light, and I believe HID bulbs give off a great deal of near IR as well. (In addition to the visible light given off by both of course.)
The question would be if the reflected near IR would actually make it back to the camera underwater, or would it be filtered out by the water? Trying it with a digital camera and filter first would probably be the way to go before purchasing some film.
Marbry