Conversation

hahaa! Successfully removed all IR and UV filters from my old Canon EOS 600D, I can do full spectrum, UV and IR photography now!

All of the following photos have been taken with a ~550nm+ lpf, meaning cutting everything under 550nm (blue, purple and uv) off. I love the vibrant pink foliage and dramatic turquoise skies

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this is so cool!! Taking photos with atypical spectra is a lot of fun, even with the rather old and bulky camera. The imaging technique used here emulates old Kodak Aerochrome film stock. It’s not available anymore, but used to be a colour IR film, which mapped the IR on the blue channel, while remapping red and green to get this pink-foliage look. I do the same here! Blue is solely IR and swapped with the red channel in post.

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I also retook a few recent photos in this lovely Aerochrome-style IR! They actually look fantastic, not even sure which versions I like more now.. :D

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The camera also is already nutria approved!! Got sniffed and was found to be okay (I think..)

Also, man, water!! The turquoise is just fantastic!

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There are some hardships though, since the camera now sees a lot more light (the full IR spectrum), but the light-meter cannot process that properly, auto-exposing is off by about 2 steps. Even worse, with the missing filters and the phase-detect diodes not being in that path anyways, the auto-focus is now off by a tiny bit. You can get used to it, but at first, I was just way off with my focus and exposure.

The resulting images are also very much discoloured, this is because the red and blue channels have to be swapped, which given that I shoot raw becomes annoying. I don't think there is a command line tool to switch two channels in a canon raw-file (.cr2), imagemagick will just invoke darktable.

Using darktable for development would be great, but I sadly have a bunch of bugs with it and my tool of choice is anyways DxO PhotoLab... which cannot swap colour channels -.-

So my workflow right now is to demosaic all photos in DxO, export them as 16bit tif files, then run a batch imagemagick command to swap the red and blue channel on all photos, just to re-import them in DxO for final development. This actually not tedious, just time intensive...

Anymeow, this is how a raw image without development actually looks like. The white-purple foliage is actually neat, maybe I will do something with it as well some time, but for now I enjoy the pink-turquoise style more

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@janamarie The autofocus might actually just be because of the fact that IR focusses on a different plane than regular light in a normal lens. Most of my pentax lenses have a seperate mark that you need to twist the lens to for IR photography *after* you've focussed the shot, and I can confirm on my z70 (film) the autofocus indeed misses the mark if you don't take that into account.

I did get to trichrome (quadchrome?) some rollei IR film on it though. Fun stuff
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@miifox that's part of the issue, yes. The other issue is that the sensor actually sits on a different plane than the focus diodes (it's as DSLR) and I don't have a proper focus calibration rig

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