nice tutorial, I have a question though, my camera has a max iso of 1600 and a max shutter speed of 30 seconds, so I'll never be able to use a totally black filter, but do you have an idea of another filter I can use? I mean one of 720 nm for example, would that be good?
Something like the hoya R72 should work. Does the camera not have a bulb mode where you can hold the shutter open indefinitely with a remote, you have to time the shots yourself but it lets you get long exposures.
indeed, but I'm still not sure my camera is compatible with it (it's a canon 1000d). Cause I found things on the internet about an IR cut filter on some camera's and that should be removed before making IR photos... what do you know about that? I don't want to open up my camera and ruin it :S
All dSLR's have a filter inside that cuts out IR light to varying degree's. Thats what gives you the really long exposure times when you use an IR filter as basically your cutting out both kinds of light so very very little light is actually getting through so you need a long exposure. It's possible to modify the camera by removing the IR cut filter and adding one that cuts visible light then you camera operates like normal but takes IR photos.
It will work with just an IR filter and a long exposure though
The red effect is due to the white balance being wrong. Its quite common that the shots come out red, if you shoot in raw it allows you to change the white balance afterwards giving you a little bit more room to get the colours balanced.
Im not quite sure what the blue flare is being caused by, its possibly a light leak. Is the filter a screw in one or is it a square one in a holder. It might be work trying to see if there is any light leaks as even the smallest leak will have detremental effects on the photo. It might also be caused by light leaking in through the viewfinder, it might be worth blocking it up during the long exposures to help erradicate light leaking.
The one I have cost me about $60 from hong kong but a 77mm Hoya R72 which is one I want to get costs quite a lot, in the $140+ region which is why I went for the cheaper filter to start with as I wasnt sure if I would like doing IR stuff.