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Annex C – IR Filter
IR FILTER
An IR Filter (Infrared Cut-Off Filter) is standard on all cameras. This filter will cut-off
wavelengths above 650nm.
The Color Chronos 1.4 benefits from the IR Filter because of improved color
reproduction.
All color pixels (red, green, and blue) have some parasitic sensitivity to IR light, which
results in washed-out images, especially in daylight or under incandescent lamps. The
IR Filter removes this invisible light.
The Monochrome Chronos 1.4 benefits from the IR filter when recording objects that
emit large amounts of IR light, such as glowing objects or sparks. The IR light will focus
differently than visible light in most lenses, resulting in blur. The IR Filter removes this
light, less total light hits the image sensor, and sensitivity is reduced. The result is
sharper images.
REMOVING THE IR FILTER
• You can remove the IR Filter for cleaning, or for applications that require IR
sensitivity.
• You can also add your own filter, of any desired wavelength.
• The camera accepts 15x15mm square filters, of 1.1mm thickness.
WARNING: When handling, it is important that you do not scratch the filter. Use the necessary
tools and cleaning products to avoid damage.
To remove the filter, follow the steps below, or see the tutorial at
https://www.krontech.ca/wp-content/uploads/2020/01/IR-Filter-.pdf :
1. Loosen the Back-Focus adjustment screw on the bottom of the camera about 1 turn using the
included 2mm Allen key.
2. Unscrew the CS ring from the camera.
3. Using a 1.5mm Allen key (not included), remove the two screws that hold in the IR Filter case.
4. Using tweezers, remove the IR Filter case.
5. Remove the IR Filter. To avoid damaging it, a vacuum pick-up tool is best, but tweezers can be
used, if you are careful. It is important to remember which side of the filter faces out of the
6. camera, as the filter has an optimum direction for light travel.
7. Store the IR filter where it will not be scratched, such as in a paper envelope.
8. Reinstall the filter case using the two screws.
9. Reinstall the CS ring.
10. Tighten the Back-Focus adjustment screw, finger-tight. Be careful not to over-tighten it.
11. Perform a Back-Focus adjustment. Reinstalling the CS ring to its original position will not work, as
12. the Back-Focus is changed by refraction in the IR Filter glass.
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