 "Metabones Canon EF to Micro Four Thirds T Speed Booster ULTRA 0.71x (Black Matt)" " Metabones Matt) | WTS Broadcast
"<span style="color: #000000;">Since its inception, Metabones has been designing and manufacturing lens adapters recognized among professionals and enthusiasts as leaders in design and workmanship.
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Contrary to the popular trend of other factories using an aluminum ring painted black on the camera-body-side, we instead take no short-cut but use precision-machined brass with chromium plating on both the camera-body and the lens sides of our adapters, in order to ensure smooth mounting, great appearance, and durability. The lens side of the adapter features a strong leaf-spring structure, strengthening the adapter-lens connection and ensuring tightness of the lens in order to reduce wear and prevent focus errors and optical alignment issues from appearing.
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Metabones uses matte-black treatment to keep internal reflection to a minimum in order to maintain the maximum optical quality possible with the lens.
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All Metabones Adapters follow this tradition of uncompromising precision, robust build quality and outstanding finish. Our new Smart AdapterTM series of products add industry-leading electronic interfacing technology from Canada, with true electronic control of the lens' aperture directly from the camera body.<br />
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<strong>Select the correct EF-MFT Speed Booster fits for your camera:
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<img alt="" src="http://www.metabones.com/assets/a/stories/CompatibilityMTF.png" style="font-family: Arial,Helvetica,sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 19.6px; text-align: justify; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; width: 600px; background-color: #ffffff;" /><br />
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Always Enhance and Never Degrade the Performance of the Attached Master Lens
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Like the ULTRA series for Sony E-mount, the new Speed Booster ULTRA m43 uses an advanced 5-element 4-group optical design incorporating ultra-high index tantalum-based optical glass.  However, the new design is specifically optimized for the Micro Four Thirds sensor and filter stack, and as a result achieves an astonishing level of performance that sets a new standard for focal reducers.
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Like the revolutionary original Metabones Speed Booster&reg; announced in January 2013, the Speed Booster ULTRA m43 has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless Micro Four Thirds mount cameras from 2.0x to 1.4x.  However, the new ULTRA design makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is almost perfectly corrected for use with all fullframe SLR lenses regardless of aperture.  The Speed Booster ULTRA m43 will also work extremely well with many DX and APS-C format lenses provided the image circle of the lens is large enough.  Optical performance of the new Speed Boosters is so good that the MTF of any lens attached to it will be improved.  Even the latest generation of ultra-high performance SLR lenses such as the Zeiss Otus series can be improved by adding a Speed Booster ULTRA m43. <br />
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<strong>Autofocus with an Optimum Balance of Accuracy, Speed, Consistency and Reliability
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New in Speed Booster ULTRA for Canon EF Mount to Micro Four Thirds is autofocus support, subject to certain limitations (see table above for details). We are pleased to report that Panasonic Micro Four Thirds camera bodies are capable of autofocusing accurately even if the maximum aperture of the Speed Booster and the lens combined is in the sub-f/1.0 range. Although our first and foremost priority is accuracy, we are able to make great strides in autofocus speed as well.
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Autofocus Lens Compatibility List
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<em>The following table lists lenses which has been tested. Other lenses not listed here typically works well, too.</em></span><br />
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<span style="font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 16.8px; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; display: inline ! important; float: none; background-color: #ffffff; font-family: Arial,Helvetica,sans-serif; color: #000000;"><strong>Accurate</strong><br />
</span>&bull; <span style="color: #000000;">Canon EF 8-15mm f/4L USM Fisheye
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&bull; Canon EF 20-35mm f/3.5-4.5 USM
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&bull; Canon EF 24-105mm f/4L IS USM
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&bull; Canon EF 28-80mm f/3.5-5.6 II
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&bull; Canon EF 35-80mm f/4-5.6
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&bull; Canon EF 40mm f/2.8 STM
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&bull; Canon EF 50mm f/1.2L USM
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&bull; Canon EF 50mm f/1.4 USM
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&bull; Canon EF 50mm f/1.8 STM
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&bull; Canon EF 70-200mm f/2.8L IS II USM
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&bull; Canon EF 70-300mm f/4-5.6L IS USM
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&bull; Canon EF 85mm f/1.2L II USM
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&bull; Canon EF 100mm f/2.8L IS Macro USM
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&bull; Canon EF 100mm f/2.8 Macro USM
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&bull; Canon EF 100-400mm f/4.5-5.6L IS USM
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&bull; Canon EF 100-400mm f/4.5-5.6L IS II USM
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&bull; Canon EF Extender 1.4x III
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&bull; Canon EF Extender 2x
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&bull; Sigma 18-35mm f/1.8 DC Art
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&bull; Sigma 18-125mm f/3.8-5.6 DC HSM
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&bull; Sigma 24-105mm f/4 Art
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&bull; Tokina AT-X PRO 11-16mm f/2.8 DXII</span><br />
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<strong>Tested by the community, thanks!</strong><br />
<span style="color: #000000;">&bull; Canon EF 70-200mm f/2.8L IS USM (Mark I)
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&bull; Canon EF 85mm f/1.2L USM (Mark I)
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&bull; Canon EF 200mm f/2.0L IS USM
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&bull; Canon EF 300mm f/2.8L IS USM (Mark I)
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&bull; Canon EF 400/2.8L IS USM (Mark I)<br />
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            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="text-decoration: underline; color: #000000;"><strong>Inaccurate</strong></span></p>
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            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="color: #000000;">Canon EF 50mm f/1.8 II<br />
            Sigma 50mm f/1.4 EX HSM<br />
            Tamron SP 24-70mm f/2.8 Di VC USD A007<br />
            Tamron 28-300mm f/3.5-6.3 XR Di VC A20<br />
            Tamron SP 70-200mm f/2.8 Di VC USD A009</span></p>
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            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="text-decoration: underline; color: #000000;"><strong>Manual focus only</strong></span></p>
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            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="text-decoration: underline; color: #000000;"><strong>Not supported</strong></span></p>
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            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="color: #000000;">Contax N lenses modified by Conurus<br />
            Tamron SP 17-50mm f/2.8 VC B005<br />
            Zeiss ZE lenses</span></p>
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            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="color: #000000;">Focus confirmation "chips"</span></p>
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<span style="color: #000000;"><strong>Accurate only on newer cameras such as Panasonic G7 and GX8
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&bull; Canon EF 70-200mm f/4L USM (non-IS)
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&bull; Canon EF 135mm f/2L USM
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&bull; Canon EF 200mm f/2.8L II USM
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&bull; Canon EF 300mm f/4L IS USM<br />
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<strong>Manual Focus Lens Compatibility
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Some improperly-made M42 screw mount adapters may short the electronic contacts of the Speed Booster and cause damage to the Speed Booster and/or camera body.
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Focus confirmation "chips" such as Dandelion are incompatible.
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Many manual focus lenses (e.g. OM 28/2.8, OM 50/1.8, Leica R 15/3.5) have rear protrusions (spikes, levers, other appendages) which would damage the optics and/or housing of Speed Booster. They need to be modified before they can be safely used on Speed Booster. Check and make sure there are no rear protrusions from the adapter/lens combination before using on Speed Booster. Scratches and damages caused by rear protrusions on Speed Booster are not covered by warranty.<br />
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<h3 style="margin: 0px; padding-top: 1em; font-family: Arial,Helvetica,sans-serif; font-style: normal; font-variant: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; background-color: #ffffff; text-align: justify;"><span style="color: #000000;"><strong>List of manual focus lenses which REQUIRE MODIFICATION to be used on Speed Booster</strong></span></h3>
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            <h1 style="margin: 0px; padding-top: 2px; font-size: 12pt; white-space: nowrap;"><span style="color: #000000;">Leica R</span></h1>
            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="color: #000000;">Super-Elmar-R 15mm<br />
            Elmarit R 28/2.8<br />
            Elmarit R 35/2.8<br />
            Summicron R 50/2<br />
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            <h1 style="margin: 0px; padding-top: 2px; font-size: 12pt; white-space: nowrap;"><span style="color: #000000;">Nikon F</span></h1>
            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="color: #000000;">20/2.8 AI-S</span></p>
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            <h1 style="margin: 0px; padding-top: 2px; font-size: 12pt; white-space: nowrap;"><span style="color: #000000;">Olympus OM</span></h1>
            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="color: #000000;">OM 18/3.5<br />
            OM 21/2<br />
            OM 21/3.5<br />
            OM 28/2.8<br />
            OM 50/1.8</span></p>
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            <h1 style="margin: 0px; padding-top: 2px; font-size: 12pt; white-space: nowrap;"><span style="color: #000000;">Pentax K</span></h1>
            <p style="margin: 0px; padding-top: 0.5em; padding-bottom: 0.5em;"><span style="color: #000000;">Every Pentax K-mount lens has a protruding fin and an aperture lever. It does NOT fit.</span></p>
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 "EF-S 55-250mm f/4-5.6 IS II"@en "Canon EF-S II | Canon Online Store"@en
"Telephoto Zoom"@en 
 Focal Length & Maximum Aperture 55-250mm f/4-5.6 Lens Construction 12 elements in 10 groups, including one UD-glass element Diagonal Angle of View 27° 50'- 6° 15' (with APS-C image sensors) Focus Adjustment DC motor, gear-driven (front focusing design) Closest Focusing Distance 3.6 ft./1.1m (maximum close-up magnification 0.31x) Filter Size 58mm Max. Diameter x Length, Weight 2.8 in. x 4.3 in./70 x 108mm (maximum lens length); 13.8 oz./390g