Understanding Infrared Photography
* What is Infrared? Infrared light is electromagnetic radiation with wavelengths longer than those of visible light. We can't see it with our eyes, but special cameras can.
* IR Photography's Appeal: IR photography captures light beyond the visible spectrum, leading to several characteristic effects:
* Wood Effect: Healthy green foliage reflects a lot of infrared light, making it appear bright white in IR images.
* Dark Skies: Clear blue skies tend to darken dramatically in IR.
* Ethereal Look: Skin often appears smooth and porcelain-like.
* Higher Contrast: IR images often exhibit very high contrast, lending themselves well to dramatic black and white conversions.
Conversion Methods:
There are two main ways to capture IR images:
1. Using an IR Filter on a Normal Camera:
* How it works: An IR filter blocks almost all visible light, allowing only infrared light to pass through to the sensor.
* Pros:
* Inexpensive: IR filters are relatively affordable (around $20-$100, depending on size and quality).
* Non-Destructive: You can remove the filter and use your camera as normal.
* No Camera Modification: No need to alter the camera internally.
* Cons:
* Very Long Exposures: Because the filter blocks almost all visible light, you need very long exposure times, even in bright sunlight (seconds to minutes). A sturdy tripod is essential.
* Limited IR Sensitivity: Most camera sensors have an IR blocking filter (hot mirror) in front of them to reduce IR sensitivity and improve color accuracy. This significantly reduces the amount of IR light that reaches the sensor, requiring even longer exposures.
* Hot Spots: Many lenses exhibit a "hot spot" in the center of the image when used with IR filters. This is a bright area in the center of the image and is caused by the lens design and how it interacts with IR light. Some lenses are more prone to it than others.
2. Converting a Camera to Full-Spectrum or Dedicated IR:
* How it works: The camera's internal IR blocking filter (hot mirror) is replaced with a:
* Full-Spectrum Filter: This allows all light (visible and infrared) to pass through. Requires filters on the lens to capture specific wavelengths.
* Dedicated IR Filter: This blocks all visible light and allows only a specific range of infrared light to pass through (e.g., 720nm, 830nm, 590nm). This is the most common and generally best approach for dedicated IR landscape photography.
* Pros:
* Shorter Exposures: Much faster shutter speeds than using an external IR filter, typically close to what you'd use for normal photography.
* Increased Sensitivity: The sensor is now much more sensitive to IR light.
* Better Image Quality: Less noise due to shorter exposures.
* Real-time Viewfinder (Typically): You can often see the IR effect in the viewfinder or on the LCD screen (depending on the camera model and the specific conversion).
* More Consistent Results: Less likely to experience hot spots (although lens choice still matters).
* Cons:
* Permanent Modification: You can't easily revert the camera to normal use. It becomes a dedicated IR camera.
* Cost: Conversion is expensive (typically $200-$500 depending on the camera and the conversion service).
* Potential for Damage: If you attempt the conversion yourself, you risk damaging the camera. It's best left to professionals.
* May Affect Autofocus and Metering: Depending on the camera and the conversion, autofocus and metering may be less accurate.
Choosing a Camera for Conversion:
* Used Cameras: It's generally best to convert a used camera, so you don't risk a camera you rely on for regular photography. Older DSLRs and mirrorless cameras are often excellent candidates.
* Sensor Size: Both APS-C and full-frame cameras can be converted successfully. Full-frame cameras generally perform better in low light (which can still be a factor in some IR situations).
* Live View/EVF: Cameras with live view or electronic viewfinders (EVFs) are particularly useful, as you can often see the IR effect in real-time, even with a dedicated IR filter. Optical viewfinders will typically appear dark.
* Mirrorless vs. DSLR: Mirrorless cameras can be a great choice because you see the "live" preview through the EVF. DSLRs can also work, but you may be shooting in the dark if using the optical viewfinder.
The Conversion Process (Generally Performed by a Professional):
1. Disassembly: The camera is carefully disassembled, taking precautions to avoid dust and static electricity.
2. Hot Mirror Removal: The original IR blocking filter (hot mirror) is removed from the sensor. This is a delicate process.
3. Filter Installation: The replacement filter (full-spectrum or dedicated IR) is installed in front of the sensor. This filter is carefully aligned and secured.
4. Reassembly: The camera is reassembled, and the sensor is cleaned.
5. Calibration and Testing: The camera is calibrated and tested to ensure proper functionality.
Lens Selection for IR Photography:
* Lens Coatings: Some lens coatings interact negatively with IR light, leading to hot spots or reduced contrast. Research your lenses before using them for IR.
* Manual Focus: Since autofocus may be less reliable after conversion, especially with older lenses, manual focus can be helpful.
* Prime Lenses: Many photographers prefer prime lenses (fixed focal length) for IR photography because they often exhibit fewer aberrations and hot spots than zoom lenses.
* Test Before Shooting: If possible, test your lenses with your converted camera to identify any that have significant hot spots or other issues. Take test shots at various apertures. Many resources online list lenses known to work well (or poorly) with IR.
Shooting Techniques for IR Landscape Photography:
* Shoot in RAW: Shooting in RAW format gives you the most flexibility in post-processing.
* Exposure Compensation: You may need to experiment with exposure compensation to get the correct exposure. IR photography often requires slightly different exposure settings than visible light photography.
* White Balance: Setting a custom white balance is crucial. Try setting it on green foliage (grass or leaves) to get a good starting point. You will likely need to adjust it further in post-processing.
* Composition: Pay attention to composition. The "wood effect" can make foliage appear very bright, so use it to your advantage to create interesting shapes and patterns.
* Time of Day: Midday sun can be ideal for IR photography because it provides strong infrared radiation. However, be mindful of harsh shadows. Overcast days can work too, but the results will be less dramatic.
* Weather: Clouds can block infrared light, so clear or partly cloudy skies are generally preferred. Fog and mist can create interesting effects, but they can also reduce the overall IR contrast.
Post-Processing for IR Black and White Landscape Photography:
* RAW Conversion: Use software like Adobe Lightroom, Photoshop Camera Raw, or Capture One to convert your RAW files.
* White Balance Adjustment: Fine-tune the white balance to achieve the desired color tones. Often, you'll start with a white balance set on green foliage and then adjust from there.
* Channel Mixer: The channel mixer is your friend. You can swap the Red and Blue channels in the mixer to change the color of the Sky or Trees.
* Black and White Conversion: Convert the image to black and white using a dedicated black and white conversion tool (e.g., Lightroom's B&W panel, Nik Silver Efex Pro, or Photoshop's Black & White adjustment layer).
* Contrast and Tonal Adjustments: Adjust the contrast, brightness, and highlights/shadows to create the desired mood and drama. IR images often benefit from strong contrast.
* Sharpening: Sharpen the image to enhance details.
* Dodging and Burning: Use dodging and burning techniques to selectively lighten or darken areas of the image to emphasize certain features or create a sense of depth.
* Noise Reduction: Apply noise reduction if necessary, especially in areas with dark shadows.
Dedicated IR Filter Wavelengths (Examples):
* 720nm: This is a common and versatile IR filter that produces a strong IR effect with good separation between foliage and sky. Some visible light still gets through, so you may get some subtle colors.
* 830nm: This filter blocks almost all visible light, resulting in a more "pure" IR image with stronger contrast and darker skies.
Finding a Conversion Service:
* Lifepixel: A well-regarded company specializing in camera conversions.
* Kolarivision: Another reputable company offering camera conversions and filter sales.
* Local Camera Repair Shops: Some camera repair shops may offer conversion services, but make sure they have experience with IR conversions.
Is Conversion Worth It?
Converting a camera for dedicated IR photography is an investment, but it can be well worth it if you're serious about exploring this fascinating genre. The increased sensitivity, shorter exposures, and overall improved image quality make it a much more enjoyable and productive experience than using external IR filters.
In summary, here's a table to help you decide:
| Feature | IR Filter (On Lens) | Converted Camera (Dedicated IR) |
|-------------------|-----------------------|-----------------------------------|
| Cost | Low | High |
| Ease of Use | Easy | Moderate |
| Exposure Times | Very Long | Short |
| IR Sensitivity | Low | High |
| Image Quality | Lower | Higher |
| Hot Spots | More Likely | Less Likely |
| Permanence | Non-Destructive | Permanent |
| Viewfinder Use | Normal (But Dark) | Varies, Better with EVF |
| Recommended for | Experimentation, Limited Budget | Serious IR Photographer |
Good luck exploring the world of infrared photography! Remember to practice, experiment, and have fun.