Smoothy Slim
Smoothy Slim
Photo: cottonbro studio
f-number (ƒ/#) or Aperture/Iris Size how much light or heat a Camera Lens provides to thermal or visible sensor. An f‑number (ƒ/#) or f‑stop refers to the ratio of a lens's focal length to its aperture's diameter and indicates the amount of light coming through the lens.
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Learn More »An f‑number (ƒ/#) or f‑stop refers to the ratio of a lens’s focal length to its aperture’s diameter and indicates the amount of light coming through the lens. Lenses are typically specified with their maximum aperture ability. A low ƒ/# means a larger maximum aperture (also called a fast lens), which results in a higher light or infrared collecting ability while a high ƒ/# means a smaller aperture (slow lens), which has lower light or infrared collecting ability. The lower the f‑number, the better the lens is for visible and NIR imaging, as it results in a system with increased light (or Lux) sensitivity and allows the camera to capture more accurate images in lower light levels, long range cameras like our 135x optical zoom (15.5-2075mm) due to their high power zoom focal lengths have much higher F stop which is why there is no long range low light cameras. This why long range cameras are either thermal or require our ZLID (Zoom Laser IR Diode) Illumination ir order to have night vision. For thermal infrared cameras, having a lower f‑stop number increases the image contrast and clarity, which results in higher detection distances. This is particularly true for uncooled LWIR cameras where lower f‑number lenses like ƒ/1.0 to ƒ/1.6 are required. An ƒ/1.0 Ge lens allows for 2.5x more infrared thermal energy to be transferred to the infrared sensor than an ƒ/1.6 lens. When looking at thermal imaging it is very important to look at the lens’s f‑number, as this is often as important the thermal sensor in determining the actual performance of the system. Infiniti uses mostly ƒ/1.0 and ƒ/1.1 lenses in our LWIR thermal cameras to ensure high contrast, long-range performance for detection, recognition, and identification Infiniti optics provides a wide variety of EO/IR camera solutions all the way from a component level, open frame modules (lens and sensor attached) or as complete integrated PTZ cameras with Visible and SWIR sensors for ultra long range imaging required by a host of military and defense applications. For more information about thermal infrared imaging for night vision and surveillance see our Thermal Imaging Explained page.
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Learn More »focal length of The “f” in f-stop stands for the focal length of the lens. While focal length itself refers to the field of view of a lens, f-stop is about how much light you allow to hit the sensor via the aperture opening.
Aperture scales are handy to use as a quick reference, but they’re not the final say in how you should pick your f-stop. The truth is, there’s no single f-stop you should shoot with for any given scene. It’s a balance between your shutter speed, ISO, and aperture, and it comes down to how you want the photo to look. If you’re shooting an indoor event with low light, you might want to stop down your aperture. But you also might not want a shallow depth of field. To keep everything in focus, you could shoot with a flash and keep your aperture in a medium range, or crank up your ISO to compensate for the low light. You could also slow down your shutter speed to let in more light. With all of these settings, you have many options when it comes to setting up a shot. It’s a bit like solving a puzzle with different variables, and learning how to work with light takes a lot of trial and error.
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