But if you are building an embedded vision system, you need to know the basic concepts associated with camera technology. That will help you get started with integrating cameras into your system, at least to an extent where you know the most important camera features.

F-stops

F-number is defined as the ratio of the focal length to the aperture diameter of a lens. It is also called the f-stop number. It represents the amount of light a lens can let in. It can be calculated using the below formula.

Field of view

A smaller f-number means a shallow depth of field and a larger f-number represents a large depth of field. This essentially means that only objects within a limited distance can be kept in focus sharply if the f-number is small.

The larger the f-number, the lower the aperture, and the lower the amount of light it allows to pass through. For example, a 50mm lens with a diameter of 6.25mm will have an f-number of f/8.

TechNexion takes pride in its wide portfolio of embedded cameras. Combining that with our unmatched engineering expertise has helped us support numerous customers through their camera and lens integration journey. Considering that lens selection involves the evaluation of multiple parameters, it might turn you away from focusing on the core aspects of your product development. TechNexion can help there by acting as an imaging partner by offering our camera solutions while also helping to choose a lens that is suitable for your end application. Learn more about our embedded vision solutions here: embedded vision cameras.

Shutter speed

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Now that we have discussed where large f-number lenses are used, you can probably guess where small f-number lenses are used. A small f-number means a large aperture and hence is suited for low light applications. They can also be used in devices that do not need a large depth of field. One key thing to note here is that the sensor has to be large enough to be able to fully capture the image cone projected by the lens onto the image plane. This might require you to use a large sensor (1/2” or larger – depending on the f-stop value).

The most common objectives used on laboratory microscopes are the achromatic objectives. Such objectives are corrected for axial chromatic aberration in blue ...

It is important to note here that more light is not always good. For example, in bright sunlight, a large aperture might result in the final image getting washed out. On the contrary, in low light conditions, it is recommended to have a higher aperture. Otherwise, the output image might be too dim or dark, which may result in the loss of essential details.

As mentioned above, a large f-number denotes a small aperture and should be opted only for applications where the light supply is adequate. Though the f-number is not the only parameter that determines the quantity of light that falls on the image sensor, it is one of the contributing factors. Hence, if your vision system operates in a well-lit environment, go for a large f-number lens. This will offer you advantages such as a larger depth of field, enabling you to cover a long range.

Objective lenses are roughly classified basically according to the intended purpose, microscopy method, magnification, and performance (aberration correction).

f-stop app

Embedded vision is a vast topic. From sensors and lenses to interfaces and processors, there are plenty of areas that often contain complex concepts and ideas. There are numerous factors to consider while choosing a camera for your embedded vision system. This is why it is always recommended to work with an imaging expert like TechNexion for your camera integration journey.

Focal length

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While f-number is an important lens parameter, selecting the right lens for your embedded vision system involves much more than that. You need to consider various other factors such as sensor compatibility, focal length, field of view, lens mount compatibility, image circle diameter, etc. This makes the process of lens selection more complex than you think. Consulting an imaging expert like TechNexion is a good idea before you finalize a lens for your imaging system.

Light from the point source passes through a slit baffle and is collimated into a series of parallel rays by a convex lens. When the rays hit the half-silvered mirror, half of the light is reflected and half passes through the mirror.

Aperture

F-number determines the size of the cone of light that falls on the image sensor or plane. While it is a lens parameter, the sensor should also be compatible with the lens to ensure that the sensor area is fully utilized and no vignetting or shading occurs.

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Numerical aperture

The quality of the image output in a camera system depends on the amount and nature of light that falls on the sensor. With a smaller f-number (or larger aperture), more light can be let in, thereby increasing the possibility of getting more details of the scene. On the other hand, a larger f-number denotes a small aperture, which in turn limits the light that falls on the sensor.

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In low light situations, cameras need to maintain a large aperture for more light to come in, whereas, in bright light conditions, a small aperture is recommended. Hence, you can pick a lens for the required exposure levels based on the f-number. However, exposure can also be adjusted by controlling the exposure time of the camera, which has nothing to do with the lens.

f-stop是什么

Depth of field is the distance between the nearest and farthest objects within which they remain sharp. A lower depth of field is what is used for portrait photography while a large depth of field is suitable for capturing images across a long distance or area.

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Lens spherical aberration. Spherical aberration occurs in all lens-based systems due to the spherical shape of the lens. Light entering near the edges is ...

In this blog post, we discuss a key concept related to camera and lens technology called the f-number. We will learn its definition, how to calculate it, and its relevance in embedded vision applications.

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Sep 30, 2024 — Researchers at the University of Ottawa have made a discovery that changes what we know about light and materials.