The MC4 AF 2.0X DGX converter has genuine Gate Array IC (Integrated Circuitry). It means the converter’s unique circuitry maintains signal integrity between the camera body and lens. The 4-element design is made with high quality multi-coated optical glass supplied by Hoya Corporation, the world’s largest manufacturer of optical glass. Full AF operation with the TelePlus MC4 AF 2.0X is possible using camera lenses with open apertures of F2.8 or brighter. 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. (Manual focusing may be necessary when using lenses with smaller open f-stop values than that given above.) The DGX TelePlus converters have updated circuitry to record exif data more accurately. In the exif exposure data (meta-data recorded with a digital picture) DGX converters record the equivalent aperture and focal length of the lens setting plus teleconverter. Optically and mechanically they are identical to the prior high-quality DG series converters. MC4 AF 2.0X DGX are available for Canon EOS (EF, not EF-S), Nikon AF and Sony Alpha. Important Note:The Kenko DGX TelePlus converters are not compatible with the Canon Digital Rebel XT / EOS 350D camera body and will not function on them. All other Canon DSLR cameras bodies work with Kenko DGX converters. Specifications | | Model: | MC4 AF 2.0 DGX | | Magnification: | 2.0x | | Depth of field: | 1/2 of prime lens | | Minimum focus distance: | Same as prime lens | | Construction: | 4E / 4G | | Diaphragm coupling: | Fully automatic | | Lens coating: | Digital Multi Coating | | Exposure magnification: | Approx 4 times (equivalent to 2 diaphragm) | | Barrel length: | 26mm | | Weight: | 3.9 oz.(111g) | | Mount Available for: | Canon-EOS* / Nikon-AF / Sony Alpha | |