Apart from the lens focal length calculator function this software has 3D engine for automatic design and visualization of all elements of video surveillance systems.

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If you don’t see the Drawing Tool Shapes stencil, add it to your Shapes window. Click More Shapes > Visio Extras > Drawing Tool Shapes.

Traditional calculators cannot calculate focal length for modern wide video surveillance cameras. Modern security cameras with short lenses (2.1 – 2.8mm) have non-standard wide angles. For example 115 degrees.

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When rays of light pass through a convex lens (the shape of lens shown in figure above) they tend to converge at a single point at some distance ahead of the lens. This distance between the lens and the point where they focus is known as the focal length as specified by the symbol f in the figure. In case of a CCTV camera, the lens focuses the rays at a point where the sensor is placed. The combination of the focal length of the lens and the size of the sensor determine the field of view of the CCTV camera. The shorter the focal length, the wider the field of view, and vice versa.

It is often specified only for the desired diffraction order, not for the weaker unwanted orders. It depends not only on the grating itself, but also ...

In the earlier days,  rotating lens focal length calculators made out of paper were good and simple tools for quick calculation of the field of view. As well as the formula above. But you should not use this formula for modern wide angle cameras!

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If you want your measurements in strict alignment on the drawing’s vertical or horizontal (X or Y) axes, you might want to use the Horizontal measure or Vertical measure tool. Follow this same procedure to use them. They take measurements fixed on their grid direction, even if the tool endpoints are not perfectly aligned to the grid.

We also offer much more sophisticated CAD software for CCTV design, like our IP Video System Design Tool, that has a built-in database of more than 9000 camera models.

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The compound microscope has two systems of lenses for greater magnification, 1) the ocular, or eyepiece lens that one looks into and 2) the objective lens, or ...

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Apr 28, 2020 — The lenses used in lighthouses are shaped like a magnifying glass as a way to make the concentrated beam even more powerful.

Glue one endpoint of the Measure tool shape to one point you want to measure—the endpoint turns green to indicate it is glued. Then drag the other end to the other point. The measure tool shows exactly how far apart its end points are.

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This is commonly done in spreadsheet form for first order layout of imaging systems. The thick lens equation is derived from Snell's law and ...

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Lens Focal Length = (Distance) * 3.2 mm / HorizontalWidth where 3.2 mm is the horizontal size of 1/4″ CCTV sensor (4.8 mm for 1/3″ sensor).

We created the unique FREE lens focal length calculator that has a database of camera models and shows correct angles and DORI zones with 3D graphics:

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The standard formula above doesn’t work for such lenses. You need to have a database of camera models with horizontal and vertical angles provided by camera manufacturers.

Tip:  Because the Measure tool is a shape, it displays in the same scale as your view—that means when you zoom out to see more of your drawing, it might be too small to read. Also, at closer zooms, you have more precision in placing the Measure tool end points.