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Viewangle

Field of viewvs angleof view

Here is the new 3D Online Lens Calculator with a built-in camera database. As a better alternative you can use IP Video System Design Tool, our professional CCTV design software. With that tool you can load a site map, add multiple cameras and see how modification of any installation parameter can affect the camera coverage.

Camera Field of View on 2D site plan (different colors represent camera zones with different pixel density): Calculating Field of View for cameras on the imported site map or floor plan.

It is very important to use the right lens for desired field of view; otherwise the images on security cameras will not be satisfactory. CCTV security camera lens with fixed focal length are less expensive and give smaller distortions but do not offer flexibility in terms of field of view choices.

Also for a proper lens selection you should consider both camera installation height and object height. Without taking all these parameters in the picture, the calculation error can exceed 30%.

DOF calculator

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In everyday language the Field of View of Field of Vision, abbreviated as FOV, refers to that area which is visible through any optical instrument, which could be the human eye or a lens. This definition can be applied to the CCTV parlance and FOV can be defined as the width or height of a scene to be monitored by the security camera. In CCTV Field of View depends on a number of factors such as the sensor format, the focal length of a lens, and the distance from the objects.

field ofview中文

Built-in camera FOV calculator displays the range of viewing angles for the selected wide angle camera with variofocal lens.

For example for Hikvision DS-2CD2622FWD-I(Z)(S) the manufacturer has the following angle range specified: from 35 to 106 degrees. Ordinary lens calculators will give a wrong angle range, most likely: from 24 to 85 degrees.

fov和焦距的关系

Few years ago most of camera manufactures used camera lenses with normal lens and viewing angles for such lens could be calculated using usual ArcTan() formula.

Field of view

MXPLFLN-BD objective lenses add depth to the MPLFLN series for epi-illumination imaging by offering simultaneously improved numerical aperture and working distance.

MXPLFLN objectives add depth to the MPLFLN series for epi-illumination imaging by offering a simultaneously improved numerical aperture and working distance.

Many microscopes have several objective lenses that you can rotate to view the specimen at varying magnification powers. Usually, you will find multiple objective lenes on a microscope, consisting of 1.25X to 150X.

Hyperfocal distance calculator

FOVtofocal length calculator

The only way to calculate the horizontal angle or field of view is to use manufacturer’s data and therefore tools with database of camera models, like IP Video System Design Tool show the correct result:

Avoid using commonly available online lens calculators because modern wide-angle cameras have non-standard wide angles (like 110 degrees instead of 85 degrees calculated by outdated Field of View calculators), and only a FOV calculator with a built-in database of camera models can show correct angles and calculate FOV precisely.

Olympus microscope objective lenses for industrial inspections offer outstanding optical performance from the visible light to near-infrared region. At Evident, we offer an extensive selection of Olympus objectives suited to specific inspection requirements and tasks. Our MXPLFLN-BD objective is designed for darkfield observation and examining scratches on polished surfaces, while our SLMPLN objective is ideal for electronic assembly inspection. Find your ideal microscope objective today for your inspection task. No matter your requirements, Olympus objective lenses have you covered.

Objective lenses are responsible for primary image formation, determining the quality of the image produced and controlling the total magnification and resolution. They can vary greatly in design and quality.

The ocular lens is located at the top of the eyepiece tube where you position your eye during observation, while the objective lens is located closer to the sample. The ocular lens generally has a low magnification but works in combination with the objective lens to achieve greater magnification power. It magnifies the magnified image already captured by the objective lens. While the ocular lens focuses purely on magnification, the objective lens performs other functions, such as controlling the overall quality and clarity of the microscope image.

To clean a microscope objective lens, first remove the objective lens and place it on a flat surface with the front lens facing up. Use a blower to remove any particles without touching the lens. Then fold a piece of lens paper into a narrow triangular shape. Moisten the pointed end of the paper with small amount of lens cleaner and place it on the lens. Wipe the lens in a spiral cleaning motion starting from the lens’ center to the edge. Check your work for any remaining residue with an eyepiece or loupe. If needed, repeat this wiping process with a new lens paper until the lens is clean. Important: never wipe a dry lens, and avoid using abrasive or lint cloths and facial or lab tissues. Doing so can scratch the lens surface. Find more tips on objective lens cleaning in our blog post, 6 Tips to Properly Clean Immersion Oil off Your Objectives.