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SWIR wavelength range

Learn more about how infrared heating works, the differences between short-wave and medium-wave infrared heaters, and their respective pros and cons.

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At Casso-Solar Technologies, we’ve developed infrared heating solutions for over 60 years. We work with each of our clients to ensure they have custom-fitted solutions that integrate with their existing processes and needs, and we partner with each client through the design and implementation process to ensure complete satisfaction. Contact us today to learn more or to get started.

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Short Wave infrared vs near infrared

Underexposed = Thin negative, saturated colors, strong contrast. Colors can become rather inaccurate if severely underexposed (more than a stop or two).

Another point to remember is that it’s ok to have true blacks and true whites in an image, in fact it looks proper especially when it comes to printing. Let the space between the leaves in a backlit forest go to pure white, it makes sense to our eyes and looks good in a photo too.

SWIR camera price

Infrared heating is a reliable, basic heating method that integrates well with a myriad of manufacturing processes. The infrared energy wavelength of an object depends on its temperature. The higher the temperature an object produces, the shorter its energy wavelength, resulting in a higher output of energy. Infrared radiation is electromagnetic energy that is categorized as short-wave,medium-wave, and long-wave infrared, with short wavelengths providing the highest energy output and long wavelengths having the lowest. Long-wave or beyond long-wave infrared can be too inefficient for industrial heating processes, so they generally are not used.

“Glenns Lake Sunset” - A full range of tones captured on negative film from the deep shadows of the pines to the brightest highlights on the peak and clouds. The reflection was average metered and the sky was controlled somewhat with a 2 stop soft GND. Any more would have looked unnatural, but the sky was many stops brighter than the deepest pines. Portra 160 4x5, 75mm lens, 1 second at f22, 2 stop soft GND filter.

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IR heaters provide radiant heat without relying on the ignition or combustion of energy sources that can produce contaminants, toxins, or on-site emissions.

Manufacturers must consider both the efficiency of the infrared heat itself and the heat absorption factor of the material being processed. As a more intense heat source than convection heat, infrared heat should be applied directly to your process materials within the processing chambers of an oven or dryer. The ovens help control the timing and amount of heat applied to avoid product damage or overheating. Consult our infrared heating specialists to determine the best way to apply infrared heat to your project.

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This is just about the only thing you really need to know about negative film. A polar opposite to slides which can’t retain much detail at all if overexposed, negatives give you ample room to really reach into the brightest highlights. So long as the darker tones in a scene are exposed somewhat close to neutral the film will take care of the rest. This isn’t to say that it’s best to expose deep shadows as neutral, you still want subjects such as black rocks or pine trees in the shade to look properly dark. If you want to spot meter your scene you will likely want to consider placing these sort of objects at -1 ⅓  to - ⅓ stop.

Shortwave irapp

As we can see from the images here, negative film can take a lot of abuse. It’s easy stuff to meter for; more than anything just make sure that your subject is properly exposed and you’ll be good to go.

Exposed at Box Speed = Natural to somewhat strong colors depending on film stock. Good for general purpose landscape shooting when moderate contrast and color is desired, though a little extra exposure typically won’t hurt.

For those who like to spot meter let’s take a look at the scene below and see how careful spot metering and quick average metering will achieve the same result in this high-contrast image. I’m not trying to encourage anyone to totally change up their metering habits if you are a master of spot metering, but I am suggesting an alternative for those who are still learning (well, we all are) or want another tool in their box.

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SWIR camera

“Coastal Oak” - A scene where a GND filter just wouldn’t work. The ground and tree were the important parts of the image so I metered for that and let the highlights go. Ektar handled it well. 75mm lens, 2 seconds at f32, no filters.

“Boat House Sunrise” - A great example showing how negative film can capture both subtleties in the sky as well as a wide dynamic range from deep shadows to sunrise colors. A two stop GND was used to tone down the sky but any more would have darkened it more than the water and would appear unnatural. The boats were the critical detail here so I exposed for them. I also photographed this on slide (Provia) and had to reduce exposure a bit to make sure the sky wouldn’t get lost. The result was shadows that were too dense for my taste and the negative version is much better. Ektar 100, 135mm lens, 2 seconds at f32, 2 stop soft GND filter.

“Prairie Homestead” - Example of an overexposed negative. I typically meter Portra 160 at ISO 100, resulting in an automatic 2/3rds stop overexposure. I then also overexpose further for most of my prairie scenes by an additional 2/3rds stop. The sky was held back with a 1 stop soft GND, though it was a bit over two stops brighter than the ground. Too much filter would have resulted in darkening of the homestead. The foreground was metered at 100 with an additional 2/3rds stop added, meaning the sky was about two stops overexposed even with the filter. The result is a softer color palette for a sunrise that had rather strong colors in person. 300mm lens, 4 seconds at f45, 1 stop soft GND filter.

Shortwave irvs swir

Short-wave infrared heaters offer a lot of heating power. The shorter wavelengths can increase the amount of energy absorbed by the heated objects, and short-wave heaters can reach higher temperatures than medium-wave heaters. However, the higher operating temperatures of short-wave heaters can lead to shorter equipment lifespans over time.

“Sunflower Sunset” - Backlit scenes are no trouble with color negative film. A filter was left off for this image to avoid flare troubles with the sun. The foreground (also the important part) was average metered and the sky ignored when taking the meter reading. Ektar 100 4x5, 210mm lens, 2 seconds at f45, no filters.

Medium-wave IR heaters produce a high level of energy and can last longer than their short-wave counterparts. They are ideal for drying operations and handling water-based coats, as water can easily absorb medium-wave energy. However, these heaters have alower power density than short-wave heaters and thus require a larger footprint to deliver the same amount of energy.

Short Wave infrared wavelength

Our electric IR heaters are extremely efficient with their power consumption. For instance, our DuoTube heaters feature an integrated ceramic coating reflector to ensure that most of the infrared energy generated is directed at the product.

More realistically, it works well to find the most important object (often the subject) in a scene and meter for that. Think about how you want to luminance of that object to be rendered. If a red barn is your subject, that is usually a good neutral tone and should be exposed as such. If it’s the white bark of aspen trees you’ll want to add a stop, perhaps more depending on how the light is hitting them. If you focus on getting your most important object exposed properly, chances are the rest of the scene can be handled by negative film and you won’t have underexposed shadows. Here are some exposure guidelines for common subjects, your mileage may vary:

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Color negative film has increasingly become a larger part of my workflow over the last several years and with good reason: the flexibility of the stuff is just phenomenal. It can be used to capture all the delicate subtleties of a low contrast scene as well as landscape scenes with intense dynamic range. If you don’t know what you will be getting into when you head out for a shoot it’s an excellent choice because it can handle anything you throw at it, but that doesn’t mean it can’t be used for a specific purpose or aesthetic either. Color negatives are the film type that I get the most questions about, mostly because people see such a wide variety of looks coming out of the same film types from me. While I’ve done several articles about color negatives, metering and more, today let’s dive into pushing the limits of this incredible film.

Medium-wave infrared heating solutions radiate heat with longer length-waves. Our DuoTube heating unit can reach high temperatures of up to 1400°F or 1750 °F, depending on the coating or refractory selected. The gold-coated DuoTube has a dual-coat integral gold reflective coating, which does not oxidize and can reach temperatures of up to 1400°F. The white refractory DuoTube works on a wider emission spectrum and can reach temperatures of up to 1750°F. Both types are completely maintenance-free throughout their useful life.

Thank you for reading! If you enjoyed this content, perhaps you might also like my ebook “Film in a Digital Age.” Its 180 pages packed with knowledge and dive deep into all sorts of topics to help you master your film technique.

If you need uniform heating throughout your materials, we provide flat panel infrared heaters featuring heating elements bonded to refractory that can handle high heat.

While the underexposed image of the meadow with flowers above may look enticing, I would avoid intentional underexposure of color negatives if possible. The dark shadows in the grass is more than two stops under which is where negatives start to fall apart and turn to mud. Negatives can become so thin in the shadows that details can’t be pulled out of them no matter what scanner you use, similar to how once you blow the highlights in a slide they are gone forever. In this example image the deep shadows only make up small portions of the image and don’t steal from the scene. For this reason I tend to go with a proper exposure or overexposure with color negative film.

Our IR heaters provide consistent temperatures that can be controlled and monitored easily by operators. Each heater can be programmed with customer-specific recipes, and we can upgrade or alter the controls upon request.

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Overexposed = Dense negative, soft colors, subtle contrast. This is often used for portraits to keep soft skin tones. Nearly endless details can be pulled out of the highlights, though tonal separation in details becomes narrower.

Having all the dynamic range in the world doesn’t mean you throw caution to the wind. While bright highlights on negatives can look quite soft and pleasing, keeping your skies from being severely overexposed will retain more color and detail in them which is particularly helpful for sunset scenes where you want to have that saturation in the clouds.

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Short-wave infrared heating systems use short waves, which give off more energy and operate at higher temperatures. As a result, these heaters offer high-intensity heat that can reach 5000°F or higher. Our Casso-Solar SWL Unitube Heater can radiate waves between 0.76 and 2.0 microns, and operators can control the wavelength to align with the peak absorption point of process materials. Each unit includes controllable emitters that can be shut down to preserve energy, modified for temperature profiling, and more.

“Al’s Service” - When it comes to thunderstorms there often isnt’ time to mess around with filters. For this scene I just quickly metered the entire foreground and shot at that reading. Average metering balanced the white buildings, midtone pavement, and deep trees perfectly. Portra 160 6x7, 45mm lens, 4 seconds at f22, no filters.

For quick and consistent results, average metering the foreground area of your scene will give you an accurate reading especially with color negatives. As many of you may know I use a small digital camera to meter my scenes set to matrix metering mode. I can zoom in the lens to meter one region of the scene and it gives me a quick average reading. In nearly all of the scenes I have found the variation of light in the subject is rather reasonable and there isn’t a huge dynamic range to work with. The majority of contrast problems come from two different types of light within the same frame; for example a shaded foreground and bright sunlit peaks and sky behind it. The foreground often contains the subject interest of the photo, which in turn means that if you average meter for the shadows you are also metering for your subject in many cases.

Dynamic range is all the rage today in the digital world, but the ability to capture a wide range of light from deep shadows to bright highlights has been there for a long time with color negatives. Quantifying the exact range of the film is a tricky matter and one of the more frequent questions I get. The truth is, it would be hard to know with the tools I have on hand. Even if one were to put a figure to the number of stops the film can handle there are still practical limits. For example, if you expose a frame shooting into the sun you can often see the actual disc of the sun on the negative as well as details from the rest of the frame. The trouble comes when you want to balance this with the rest of the scene. The extreme highlights have details that can be picked up with a scanner, but in order to have those details in the final scan the rest of the frame will be flat and lifeless. Some selective editing in Photoshop (or dodging while printing in the darkroom) can help, but will only get you so far. It’s no different with digital: by blending 5 different exposures it’s possible to capture a ridiculous dynamic range, but it will look unnatural when you go to balance the extreme highlights with the rest of the frame. Long story short, good light is still important and using a wide dynamic range to capture bad light won’t make a good photo. Negative film gives us extra room to work with, but it doesn’t magically make all light good.

The light hitting the ground was softened by both the forest canopy and the distant atmosphere as the sun was about to set. There was only a few stops of variation between the shaded ground and lit ground, and averaging the two will give you a proper exposure of that region. That is the approach you could take with a handheld spot meter. The sun and brightly lit forest canopy was not something that can be average metered along with the foreground by any camera; there is just too much variation between the too and slight repositioning of the meter will give wildly different results. It also could not be filtered with a GND so it was simply ignored when making the meter reading.

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Our quartz heating elements maximize the energy that passes through them, providing very efficient heating. They can be found in our Unitube, DuoTube, and Type C+ heaters.

Casso-Solar only uses high-quality components in our electric IR heaters, meaning that they require little to no maintenance throughout their useful life, which lasts tens of thousands of hours.

We all know a lot of scenes don’t allow for GND filters such as backlit forests or times when there are objects poking up into the sky that wouldn’t look great if you darkened them with a filter. Or those times when the weather is nasty and you’re having enough trouble keeping the lens dry let alone a stack of filters. For these situations it’s best not to worry too much about the sky and expose for your subject. It is, after all, the most important part of your image and needs to be exposed properly.

Short Wave Infrared sensor

Manufacturing cycles often require heat to process materials and produce finished goods. Many manufacturers turn to infrared (IR) heating processes to provide energy efficient, high-intensity heat for various drying applications. More than 60 years ago, Casso-Solar Technologies started out as a simple infrared heaters manufacturer. Since then, we’ve continually developed our products to meet the complex, custom specifications of our clients’ projects.

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One of the biggest things to know about color negatives is how capable they are at handling a wide variety of subject matter and light. Nearly anything thrown at them can be captured if exposed accordingly and the film is nursed just right during the scanning or printing process. If your goal is to capture the extreme dynamic range of a backlit forest, no problem. Same goes if you desire a softer color palette of a scene without much in the way of contrast. A general rule to know as far as color saturation goes is that if you underexpose the film, you tend to get stronger and sometimes a bit inaccurate saturation. If you overexpose the film, you get softer colors and lighter contrast.

“Shrine Paintbrush” - An example of a half stop underexposed sheet of Portra 160, resulting in colors that resemble the saturation of a slide. 90mm Lens, 3 seconds at f22, 2 stop soft GND filter.

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The two color negative films that I use are Kodak Ektar 100 and Kodak Portra, typically in the 160 flavor. These tips should work with any color negative film, but since I have extensive experience with these two and can capture just about any scene the way it looked in my mind there’s no real reason for me to complicate my film situation with additional film stocks. It also happens to be that those are the only two color negatives that are regularly available in 4x5” sheet film. For you medium format and 35mm shooters you have a lot more options to work with.

Both short- and medium-wave IR heating systems can heat manufactured goods for processing and finishing, and each one works best for different contexts. Short-wave IR heaters are extremely energy efficient and can reach higher temperatures; the heat can also quickly penetrate objects based on their peak absorption point. Medium-wave IR heaters produce a lot of energy and tend to have a longer lifespan. Our team can help you select the right heating unit based on your manufacturing processes and needs.