An advantage of replacing Canon's
IR Cut filter with a coated clear glass window is that add-on
IR PASS filters can be used for infrared imaging. I am waiting
for the popular infrared "Hoya R72" " that I ordered
to arrive; but in the meantime, I tried infrared imaging with
a 48mm "Tiffen Red 23A" filter" that I use for
observing Mars. For infrared imaging there is a good selection
of filters available that block all wavelengths below the color
red but allow different amounts of the red wavelength along with
infrared. Some of the strongest filters are color black, passing
no color but only invisible infrared. The "Tiffen Red 23A"
filter that I used for the images below isn't the best choice
for infrared imaging, but because of the modified Rebel's great
sensitivity to infrared, it worked okay.
The following images are "mouseover
images". You will need to have scripting allowing in
your web browser for this to work. Move your mouse cursor over
the image and you will see the infrared image of the same scene.
Move the mouse cursor off the image to go back to the normal image:
on and off image:
Imaging in infrared results in
water appearing dark and vegetation such as grass appearing bright
(white). For the mouseover image below, the rocks in the stream
remind me of the Martian landscape imaged by the rovers....hey...
I think I see the Barney rock!
To learn more about Infrared Imaging
with a Digital Camera, see the Digital Photography For What
It's Worth article:
Infrared (IR) Basics
for Digital PhotographersCapturing the Unseen
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12: Daytime Infrared Hoya R72 Filter