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 ?
In those situations where the customer is trying to use an add-on 2X or 3X teleconverter lens, he or she should be steered away from it.
Compatibility is also an issue in your choice of teleconverter.
Exposure Factor - Your lens ability to transmit light to the image sensor is reduced in proportion to the magnifying power of teleconverter.
Photographic teleconverters are usually four-element designs optimized for use with camera lenses, which have much lower, more demanding f/ratios than telescopes.
If your camcorder doesn't have enough magnification, consider adding a high- quality teleconverter (2 [yen] or more) to the front of the lens or shoot through the eyepiece of a telescope.
There is also an "excenter" device that allows sweeping an eyepiece or camera around the limb of the Sun to center an object of interest (a must when using the 2x teleconverter for high-magnification work).
Prior tries to keep his photographic equipment to a minimum, usually a single digital SLR with a few zoom lenses covering wide-angle to telephoto, a teleconverter and lightweight tripod and ballhead, and the backup accessories of memory cards and batteries.