Конвертер Kenko Teleplus HD 1.4X DGX for Canon купить

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Product Description
The Kenko TELEPLUS HD DGX teleconverter contains a set of optics which multiply the focal length of your prime lens by turning a 300mm lens into the equivalent of 420mm. Teleplus HD DGX converters use unique circuitry which maintains signal integrity between the camera body and lens. It also allows accurate recording of digital EXIF data. Multi-coated optical glass is used in the optics, which is supplied by Hoya Corporation, the world's largest manufacturer of optical glass. Full AF operation with the HD DGX is possible using a camera lens with an open aperture of F4 or brighter (except Canon EF 50mm ). Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera's AF sensors properly, otherwise manual focussing may be necessary.
Box Contains
Teleconverter
Pouch Case
User Instructions

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It worked well for awhile under light use on a Canon 7D MkII and a Sigma 500mm lens, but after 3 months it failed. I was shooting an Osprey in flight fishing in a lake one day. I was using burst mode and shooting heavily, when it began to fail and eventually froze up the camera. It would work half-way if I shut the camera down and removed and replaced the battery, but it wasn't right. It hasn't worked properly since then. I contacted the manufacturer, Kenko, but they refuse to respond to my request for warranty service. So I'm stuck with an expensive POC. At least I know not to count on Kenko supporting their products.