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.