Extend the reach of select L-mount lenses with the Sigma TC-2011 2x Teleconverter. This optic magnifies the image by 2x and retains full communication between the lens and camera body, enabling metering, autofocus, and image stabilization as well as the transmission of Exif data.
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It works well with the Sigma 60-600mm sport lens paired with the Panasonic Lumix S5iix. As expected, the camera's sensor loses 2 stops of light while using the 2x teleconverter, and the autofocus isn't as strong, but still reliable and produces a clear image. Great for getting the extra needed reach of wildlife far away.
It really does a good job giving you the ability to get closer on shots. The image are clear, though not quite as sharp as without it, which is normal. I do recommend it, because it's better to zoom closer than to crop. I've uploaded a non-edited photo where I used with the Sigma 100-400mm at max zoom. So, it was 800mm with this adapter. The attached shot was taken at 1/1600 of sec, ISO 5000, f/13. NOTE: All teleconverters increase your f-stop by their multiplier. So, if you have a f/4 lens with this 2x converter, it would become an f/8 lens. This costs you considerable light, resulting in the need for higher ISO or slower shutter speed.