doubler

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doubler

[′dəb·lər]
(materials)
A localized area of extra layers of reinforcement on a section of composite material to provide extra strength to a specified site.
References in periodicals archive ?
A second major drawback to attachable 2X teleconverters is that the clarity of the overall picture is degraded by as much as 40 percent, causing problems related to picture identification and to overall customer satisfaction.
The camera also utilizes nine cross-type sensors that are fully functional when using compatible NIKKOR lenses and teleconverters with an aperture value up to f/8, which is a great advantage to those who need extreme telephoto focal lengths (single cross type sensor active with TC20E III).
Even in low-light, the D7200 utilizes 15 cross-type sensors to achieve incredible focus on moving subjects, while the center point works down to f/8, making it great for use with compatible teleconverters.
4x EX DG APO and 2x EX DG APO teleconverters produce a 70-210mm F4 autofocus telephoto zoom lens and a 100-300mm F5.
The camera also utilizes 11 cross-type sensors that are fully functional when using compatible NIKKOR lenses and teleconverters (aperture value up to f/8), which is especially useful for wildlife photography.
It is also possible to use this lens with Sigma's APO teleconverters.