Some of my work as an image engineer in the R&D branch of a machine vision camera manufacturer is about how to filter the light.
In this machine vision cameras the filters can be changed mostly without opening the camera body. The reason why the customers want to have a filter with infrared transmission are manifold.
But I suppose mostly not to create some kind of art.
For those who want to create more artistic pictures than, lets say a sorter, a DSLR or a compact camera would probably (not for sure) be better.
How one can create infrared pictures - technically spoken?
These are the main ways:
1. You take a normal camera and put a filter in front of the lens
2. You take a normal camera and take an infrared-pass filter somewhere between lens and mirror (DSLR)
3. You take a modified camera without IR-cut filter inside
3.1) You have the original IR-cut filter replaced by some kind of an IR-pass filter
3.2) You have the original IR-cut filter replaced by some kind of clear glass
3.3) You have your IR-pass filter in other places than the original IR-cut
3.3.1) You put your IR-pass filter in front of the mirror
3.3.2) You put your IR-pass filter in front of the sensor - but behind the mirror
The ways 1 and 2 have in common that the camera is unmodified, even the warranty stays unharmed. But you loose a lot of light because of the use of an IR-pass AND an IR-cut filter!
So you get very long exposure times, I do not know a camera wich could be used handhold. Probably the older Leica M8 with the bad IR-cut filter inside?
Furthermore you see nearly nothing in the viewfinder (DSLR).
Way 3 has nomaly the problem, that the camera has to be opend (not the Sigma SD 10 and 14) - so you loose your orignal warranty.
But in most cases you have short exposure times, handhold photography is possible.
With 3.1 and 3.3.2 you have the bright viewfinder (DSLR)
With the 3.3 ways you have the way to change the filter without high effort - I know only two kinds of this ways: The one is the Clip-Filter system, the other one is my modification with the filter directly in front of the shutter.
Here are some ways to get an infrared modificated camera - or how to choose the right camera and filter for infrared photography:
My own kind of IR-modification - you can change the filter easily - EOS 350D / Rebel XT
Thomas Westerhoff instructions how to changing the filter in a Canon EOS D60
Achim Schaller: EOS 10D filter change
Tim Cann modifiys a Canon EOS 20D for IR-photography
Bob McCourts modification of a Canon EOS 40 digital SLR
Christian Buil ones more about the EOS 350D - but now the autofokus adjustment - it is french, but cou could see how it is done
The "Balkonsternwarte" with their Canon EOS 350D modification
EOS 350D astro modification, Henning Nöldge
Astronomic EOS 350D, sternenbeobachter.ch
One more EOS 350D, astronomicum.de
EOS 350D / Rebel XT for astronomy modified - with special filter and a peltier cooling! Guido Küppers
Javier Gómez Laina & José Luis Rey writing about their 350D conversion
Ashley Roeckelein page about the modification of a EOS 350D / Rebel XT
Levin Dieterle's site with the conversion of a EOS 350D as a astro camera (with special filter instead of the IR-cut)
Curt Walkers mod of a Canon 350D / Digital Rebel
Rainer Hönle has some data Seite about the original IR-cut and anti aliasing filter
Sylvain Weiller build a tool to extract the IR-filter of the Canon EOS 300D out of the frame
Terry Lovejoy altert his Canon 300D for astonomy
Gary Honis retrofits the filter in a Canon EOS 450D / Rebel XSi and 1000D / Rebel XS
Kleptography.com shows how to tinker on the Canon G1 und G2 Powershot compact cameras and some useful information for everyone
Chun Lo modifys a Canon Powershot G2
Deadpixel @ IRPhotography.org wrote something to his Nikon D70 / D70i infraredphoto conversion
Christian Buil change the filter in a Nikon D70 to increase the IR-sensitivity
Nikon D70 infrared optimisation , Michael Kunze
Pablo at IRPhotography.org: Some hints, which cameras are usable for IR photography - I suppose which asre sensitiv without modification
Infrarot-Forum - a good source about IR-Photography, in German
Kobold_IR from the Infrarot Forum about his conversion of a Canon Powershot S5 IS, in German
Sony 707 disasembly and filter changing
Sony Alpha 100 infraed conversion , Dragos
wbicher from the german Infrarot Forum about his simple Canon G1 Infrarot-modification
Stefan R. Hübner about his Canon S5 IS IR tinker work
Frank Gähler describes his FourThirds IR moficication of an Olympus E-420 with Edmund Optics plastics filter
Jens Birch upgrades a Olympus E1 for infrared pictures
LensPlay.com: Canon IR-compatible lenses
Transmission of the filters from a Nikon Coolpix 950 and a 990 infrared-cut filter - but I think uses filter with more than 70% transmission
Nikon Coolpix 3100 NIR Hack , elrobis
Jens Roesners improvement of a Olympus Camedia 2040 rangefinder as a IR-Cam
Fuji FinePix 1300 IR Modifizierung , Mark Hoekstra
Instructables.com: Infrarot cheapy
Jens Roesner: IR filter reccomendations
Thomas Koehler upgrades his Pentax *ist DS for IR
Sean Carpenter modifys his Pentax *ist DS without cutting the cables
Vincenzo Micelis infraredmodification of a Pentax *ist D - these Pentax cameras have noting glued like the Canon EOS 350D !
Jens Roesner: Pentax *ist DSLR modification - done by Pentax!
Jens Roesner refines a Minolta 7x to take ir shots
NikonPont.de: Infrared-usability of Nikon cameras and lenses (Hotspots..)
LifePixel.com - performs infrared modifications for customers, but shows also how to to it by yourself:
Nikon D50, D70, D70s, D100, D1, D1x, Coolpix 995, Coolpix 5400.
Fuji FinePix S3 Pro
Canon 5D, D60, 10D, 20D, 350D / Rebel XT, 300D / Rebel, Powershot G3, Powershot G5
LeZot infrared conversion services
Spencerscamera is also a conversion service
DSLR Astro Tec modifys customer cameras
Baader Planetarium, a further provider of IR-conversions, and filters
David Burren: Special SW-RAW Konverter for IR-modifieyd cameras - but since january 2007 in beta testing
David Burren wrote about different IR-filter-options, in respect to normal IR-cut filters
Transmission spectra of a bunch of infrared-pass filters (Kodak Wratten 89B,88A,87,87C,87B,87A, Schott / Heliopan RG695,RG715,RG9,RG780,RG830,RG850,RG1000, Hoya R-70,R-72,RT-830,IR-76,IR-80,IR-83,IR-85,RM-86,RM-90,RM100, B&W 092,093,094), eazypix.de
Gerd Neumann provides Clip Filter, these are fast changeable and are mounted in front of the reflex mirror - but for Canon the EF-S lenses couldn't be used with that
Maxmax does also provides IR modifications and sells some IR transmittance filter
How to cut glass - wikiHow
The Fuji S3 Pro is a NIR camera
The Canon EOS 20Da - a IR-camera too - and I suppose the first DSLR with Liveview
Lloyd L Chambers has some great Ir-Photos and some hints - but nothing for DIY
Horst Fischers links to good infrared photographers