Canon EOS 5D MkIII Body IR Modified 720nm
This Camera is Infrared Modified therefore will not give the same images as a regular 5D MkIII
Conventional (visible light) photography is the formation of images with light at wavelengths from 380nm to 750nm.
Infra-red (IR), or more correctly known as near infra-red (NIR), photography is the formation of images with humanly-invisible light at wavelengths from 750nm and above. Most IR photography involves wavelengths up to 1200nm. IR photography is done with a very dark (opaque-looking) IR-passing filter which could be made of glass or plastic.
Generally, there are 2 broad methods to produce IR images with digital cameras. First, the attachment of an IR-pass filter over the lens. Second, the attachment of an IR-pass filter replacing the imager (CCD/CMOS sensor) pass filter
This camera has an IR filter over imager
Attachment of IR-pass filter over the imager (by removing the camera?s visible light filter) requires skillful camera dismantling and precise focus calibration. These procedures can only be performed by a qualified camera technician. Very often, focus calibration requires the use of proprietary service software available only at authorized service centers.
With an IR filter over the imager, IR photography is faster and easier to do. Exposures are short (not requiring a tripod). Since the IR filter is attached over the imager, there is no viewfinder black-out with DSLR cameras, hence the feel of a normal (unmodified) camera. The occurrence of hot spots is unlikely, making many more lenses IR-compatible with DSLR cameras.
Starting IR photography with a dedicated digital camera
- Obtain a digital camera to be modified into a dedicated IR camera. Most people use their old or backup digital cameras that are still in good working condition, Digital SLR or Compact camera.
- Send your camera to ACS and a qualified camera technicians with specialized tools and proprietary diagnostic/calibration will dismantle the camera in a specialized clean booth ,the ban pass filter is removed and replaced with the dedicated IR filter and the auto exposure meter is altered to correctly respond to the same wavelength. Once the camera is assembled the focus is calibrated to best suite the main lens used with the camera.
- When you receive your IR-modified and calibrated digital camera, you may shoot IR images almost as easily as normal conventional photography. Try Auto White Balance (AWB) first, or for better control over the results, use custom white balance (CWB) by measuring on a patch of grass/leaves or at the blue sky.
Advantages of a dedicated (IR-modified) digital camera
- Increased transmission of infrared light on to the imager results in faster exposures and lowered ISO.
- Fast exposure allows handheld photography and freezing of moving subjects. Fast exposures are also less susceptible to electronic noise.
- Lowered ISO images are less vulnerable to electronic noise, hence resulting in smoother and higher definition images.
- With a DSLR camera, composition and focus is possible through the viewfinder. There is no black-out due to an IR filter attached over the lens.
- With only an IR-pass filter fitted, visible light is eliminated in the captured images; hence optical interference from visible light is absent. This can result in sharper (properly focused IR light) and stronger contrast images.
- IR-modified cameras can be, and should be, focus calibrated for the IR spectrum since IR does not focus on the same focal point as visible light. Even in the visible light spectrum, red and blue do not focus on the same focal point.
- If the digital camera was modified properly with focus calibrated for IR, there is no need to manually compensate the focus. (Only the lenses within the calibrated range)
Colours & white balance
Using Auto White Balance (AWB), some digital cameras may produce IR images with a strong yellowish/reddish/brownish colour cast known as false colour. This is due to the characteristics of the imager and processing algorithms. Post-processing in Adobe Photoshop (or similar) is required to remove/reduce this false colour effect. False colour can be removed/reduced by shooting images with Custom White Balance.
Using Custom White Balance (CWB) measured on sun-illuminated grass/leaves (a ubiquitous available midtone), IR images tend to appear more monochromatic.
When using the Colour mode, random spots of colour (colour artifacts) may occur in images. If the camera has Black-and-White mode, using this mode will eliminate colour artifacts, and may strengthen the monochromatic appearance in IR images.
Generally, there are 4 possible combinations of photographic modes to shoot infrared images.
- Colour mode with AWB
- Colour mode with CWB
- B&W mode with AWB (unavailable on some cameras)
- B&W mode with CWB (unavailable on some cameras)
More false colours can happen with other white balance settings such as Tungsten or Fluorescent.
Post-processing of IR images
- Open your IR images in Adobe Photoshop. Click Image > Adjustments > Auto Contrast if your images are underexposed due to the filter.
- Click Image > Adjustments > Channel Mixer. Select Red Channel in Channel Mixer, slide your Red percentage to 0% and Blue to 100%. Now select Blue Channel in Channel Mixer, slide your Blue percentage to 0% and Red to 100%. The basic process is done.
- You can still further tweak the colours to your desired effect.
- To enhance whites/highlights:
Click Image > Adjustments > Selective Colour. Select Neutrals. Slide the Black to a negative percentage to enhance whites/highlights. Experiment with the Method - Relative or Absolute.
- To obtain a cyan-tint:
Click Image > Adjustments > Selective Colour. Select Black. Slide the Yellow to a positive percentage.
- To obtain a yellow-tint:
Click Image > Adjustments > Selective Colour. Select Black. Slide the Cyan to a positive percentage.
Information provided by Advanced Camera Services Limited
Lenses Not Suitable for infrared photography:
The following table is a reference list of lenses for infrared. Some lenses give a "hot spot" in the centre of the picture that appears as a soft or "smeared" area directly in the middle of the shot.
- Canon EF 85mm f/1.8
- Canon EF 200mm f/2.8L
- Canon EF 15mm f/2.8 Fisheye
- Canon EF 16-35mm f/2.8L (I or II)
- Canon EF 20mm f/2.8
- Canon EF 20-35mm f/3.5-4.5 USM
- Canon EF 24mm f/2.8
- Canon EF 24-70mm f/2.8L II
- Canon EF 24-85mm f/3.5-4.5
- Canon EF 28-70mm f/2.8L
- Canon EF 28-105mm f/3.5-4.5
- Canon EF 35mm f/2
- Canon EF 35-80mm f/4-5.6
- Canon EF 50mm f/1.4
- Canon EF 70-200mm f/2.8L IS
- Canon EF 70-300mm f/4.5-5.6 DO IS
- Canon EF 85mm f/1.8
- Sigma 10-20mm f/4.0-5.6 EX DC HSM
- Sigma 17-70mm f/2.8-4.5
- Sigma 18-50mm f/2.8 EX
- Sigma 30mm f/1.4
- Sigma 70-200mm f/2.8
- Tamron 18-200mm f/3.5-6.3 AF XR (IF) Di-II
- Tamron 70-300mm Macro
- Tokina 12-24mm f/4
- Canon EF-S 10-22mm f/3.5-4.5
- Canon EF-S 18-55mm f/3.5-5.6
- Canon EF 50mm f/2.5 Macro
What's in the box
- Canon EOS 5D MkIII Infrared Modified Body
- Mains Lead
- 2 x Batteries
- Case or bag
- Body cap