We test the 40D with a Hoya R72 filter for infrared capability.
The Canon 40D (available from B&H Photo) is an impressive camera. But how does it handle infrared photography? For these tests we used a Hoya R72 filter on the camera and mounted it on a solid tripod and used a cable release.
The resulting images show that the 40D is capable of great IR photography provided you are in no hurry.
This is how the image looks straight from the camera. The exposure was 100ISO, f4 and 30 seconds
The original image
An optimized image converted from the red channel:
From the green:
From the blue:
As you can see, image quality can be excellent.
This image was taken with an exposure of 30 seconds and f4 at 100ISO.
At this exposure the red channel is over exposed.
The green channel is somewhat under exposed.
As is the blue channel.
And for an examination of image noise. The first image in each pair is the straight image, the second is the green channel.
As you can see, the 40D is a very capable infrared camera.