Before you consider any other teleconverter, take a closer look at the Sigma Tc-1411 1.4x Teleconverter, meticulously crafted for exclusive use with Leica L-Mount lenses. This high-quality, durable accessory is strategically positioned between the lens and the camera body, amplifying the focal length by an impressive 1.4x. The Tc-1411 is a testament to Sigma's relentless pursuit of superior image quality, as it seamlessly maintains the optical performance of the original lens while extending its focal length. This innovative teleconverter is a versatile addition to your camera gear, offering an 'ultra telephoto' angle of view for telephoto and macro lenses, thereby enhancing the performance of the original lenses.Designed with a robust dust- and splash-proof construction, the Tc-1411 is comparable to Sigma's Sports line lenses. This ensures it can withstand challenging outdoor shooting environments, especially when paired with a dust- and splash-proof camera body and lens. Despite its compact size, this teleconverter is capable of delivering remarkable optical performance, thanks to its latest design that upholds the high performance of the original lens while providing a high shooting ratio.The Sigma Tc-1411 1.4x Teleconverter is also compatible with autofocus across all apertures and focal lengths. To ensure the highest quality, each converter undergoes Sigma's proprietary Mtf measuring system ""A1"". This system uses 46-megapixel Foveon direct image sensors, allowing for the detection of even high-frequency details that were previously undetectable. With the Sigma Tc-1411 1.4x Teleconverter, you're not just adding a piece of equipment to your gear you're enhancing your photographic potential..