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Fixed Focal Length Lens Extenders

As an alternative to spacers, adding a negative focal length doublet lens to the camera end of an optical system can decrease the field of view while maintaining the original working distance specifications. For instance, increasing the focal length by 2 decreases the field of view by the same factor. Therefore, the 2X extender converts a 25mm FL lens to a 50mm FL lens. Designed for CS- or C-Mount video lenses.

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