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Telecentric Lens Size Control

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Telecentric Lens Size Control

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  • Author: Gregory Hollows, Nicholas James
The field of view (FOV) of any telecentric lens is limited by the front optic diameter; the larger the required FOV, the larger the front optic diameter. Telecentric lenses can grow quite large and heavy with small magnifications, as such magnifications require large front optics; this can be prohibitive in some setups where weight or size is a concern. The f/# of a lens also plays into the size of the lens, particularly at large magnifications where the front optics also grow with the speed of the lens. Figure 1 shows two different 4X telecentric lenses of different f/#s. The lens at the top of Figure 1 shows a system that runs at f/6, and the lens at the bottom runs at a much slower f/16.

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