Field Of View is the maximum area of a scene that a camera can focus on/capture. It is represented in degrees. Depending on how you measure it, FOV can be represented either vertically, horizontally, or diagonally as shown in the image below:

Many times microscope objectives with high magnifications will have very short working distances to the focused spot. Because of this short distance, if one is not careful while focusing in on the targeted specimen, the end of the microscope objective may "crash" into the object under study. These Long Working Distance Objectives are ideal to use when the application requires there be room between the objective and the target for other equipment like pipettes or syringes. These objectives have some of the world's longest working distances.

2023216 — The longer the focal length, or the higher the mm of the lens, the narrower the angle of view is and the higher the magnification of the image.

From this equation, it can be understood that the shorter the focal length, the wider the AFOV, and vice versa. This is clearly depicted in the figure below:

In embedded vision – in most cases – the image sensor is chosen first. This would mean that the choice of lens is heavily determined by the sensor you use (since AFOV depends on the sensor size). For a given sensor size, to achieve a wider FOV, you need to go with a short focal length lens and vice versa. However, since the focal length cannot be made shorter beyond a point, increasing the sensor size also helps to achieve a wider FOV.

Field of viewmicroscope

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Picking the right lens considering multiple factors can sometimes be overwhelming. And this is where e-con Systems can help. While integrating our camera modules, we work closely with our customers to help them choose the best-fit lens for their application. We also extend lens fixation and lens mount customization services.

Infinity corrected objectives are used in a wide variety of imaging and laser focusing applications. Light rays leaving the objective’s rear aperture are collimated, so that for imaging applications, a secondary lens (usually called a tube lens) is needed in order to focus the collected light from the specimen onto the sensor. The labeled magnification is calculated, assuming the objective is being used with a tube lens of a particular focal length by design. When a tube lens of a different focal length is used, the magnification will need to be adjusted accordingly. As an advantage over finite conjugate objective lenses, a variety of auxiliary optical components, such as optical filters and polarizers can be inserted between the infinity objective lens and the tube lens without altering how the beam propagates and forms the image down the optical path. In laser applications such as optical tweezers and laser cutting, laser beams entering the rear aperture of an infinity objective can be tightly focused to a diffraction-limited spot, providing concentrated optical power and excellent resolution.

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Infinity corrected objectives are used in a wide variety of imaging and laser focusing applications. Light rays leaving the objective’s rear aperture are collimated, so that for imaging applications, a secondary lens (usually called a tube lens) is needed in order to focus the collected light from the specimen onto the sensor. The labeled magnification is calculated, assuming the objective is being used with a tube lens of a particular focal length by design. When a tube lens of a different focal length is used, the magnification will need to be adjusted accordingly. As an advantage over finite conjugate objective lenses, a variety of auxiliary optical components, such as optical filters and polarizers can be inserted between the infinity objective lens and the tube lens without altering how the beam propagates and forms the image down the optical path. In laser applications such as optical tweezers and laser cutting, laser beams entering the rear aperture of an infinity objective can be tightly focused to a diffraction-limited spot, providing concentrated optical power and excellent resolution.

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In this article, we attempt to learn what focal length and field of view are, their differences, and why it is important to understand the two concepts thoroughly when it comes to choosing a lens for your embedded vision application.

Focal length is the defining property of a lens. It is the distance between the lens and the plane of the sensor, and is determined when the lens focuses the object at infinity. It is usually represented in millimeters. Its value depends on the curvature and the material of the lens.

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Usually, the horizontal dimension (which is nothing but the HFOV) and the working distance are given values. Using these, you would be able to calculate AFOV.

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Prabu is the Chief Technology Officer and Head of Camera Products at e-con Systems, and comes with a rich experience of more than 15 years in the embedded vision space. He brings to the table a deep knowledge in USB cameras, embedded vision cameras, vision algorithms and FPGAs. He has built 50+ camera solutions spanning various domains such as medical, industrial, agriculture, retail, biometrics, and more. He also comes with expertise in device driver development and BSP development. Currently, Prabu’s focus is to build smart camera solutions that power new age AI based applications.

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Many times microscope objectives with high magnifications will have very short working distances to the focused spot. Because of this short distance, if one is not careful while focusing in on the targeted specimen, the end of the microscope objective may "crash" into the object under study. These Long Working Distance Objectives are ideal to use when the application requires there be room between the objective and the target for other equipment like pipettes or syringes. These objectives have some of the world's longest working distances.

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The thread on the long working distance objectives are M26, so the M26-RMS adapter is required to step down to standard RMS threads.  Please make sure to purchase one for use with any RMS mount such as the LH-OBJ microscope objective holder.

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To learn everything about choosing the right lens for your embedded vision system, please visit the article How to choose the right lens for your embedded camera application.

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In general, the focal length and working distance of objective lens varies very little with wavelength and is usually not specified at a particular wavelength. At most, over a specified wavelength range, one could potentially see only microns of deviation, and this amount would be even smaller for apochromatic objectives.

Parfocal length

The thread on the long working distance objectives are M26, so the M26-RMS adapter is required to step down to standard RMS threads.  Please make sure to purchase one for use with any RMS mount such as the LH-OBJ microscope objective holder.

However, in most cases, the FOV of a lens is expressed using DFOV or Diagonal Field of View. So, you might have to calculate the DFOV value as well. Let us see how that is done.

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These objective lenses are an M Plan Apochromatic design which offers a flat field correction, long working distances and superior optical performance. These objective lenses offer some of the world’s longest working distances while providing a flat, chromatic aberration-free image throughout the entire field of view.

Long Working Distance Microscope Objectives are designed around 426 to 656 nm to provide a chromatic aberration-free image with flat field correction. The objectives are called “Plan” because they produce the flat image across the field of view. The “apochromat” objectives provide chromatic correction for three wavelengths and spherical correction for two wavelengths. In the case of white light, plan apochromatic objectives offer superior images for color photomicrography than achromatic objectives can provide.

Field of view and focal length are two of the most important concepts when it comes to lenses. While focal length is the defining property of a lens, field of view can vary depending on certain other parameters. And when you select a lens for your embedded vision application, you need to make sure that you pick the right one for your sensor such that the desired field of view is achieved.

Long Working Distance Microscope Objectives are designed around 426 to 656 nm to provide a chromatic aberration-free image with flat field correction. The objectives are called “Plan” because they produce the flat image across the field of view. The “apochromat” objectives provide chromatic correction for three wavelengths and spherical correction for two wavelengths. In the case of white light, plan apochromatic objectives offer superior images for color photomicrography than achromatic objectives can provide. In general, the focal length and working distance of objective lens varies very little with wavelength and is usually not specified at a particular wavelength. At most, over a specified wavelength range, one could potentially see only microns of deviation, and this amount would be even smaller for apochromatic objectives.

Now DFOV can be calculated by replacing HFOV with it in the above equation. Since AFOV and working distance are known entities, DFOV can be derived using this.

So if you are looking for help in picking and integrating the right camera into your embedded system, please don’t hesitate to reach out to us at camerasolutions@e-consystems.com. Meanwhile, you could browse through our complete portfolio of cameras here.