High standard tele converter that is perfect for new product lines SIGMA TELE CONVERTER: renewal for new concepts and better image quality The SIGMA Teleconverter is developed exclusively for the new lens lines. By mounting it in between a telephoto lens and a camera, the offered magnification of focal length of TC-2001 is 2 times. Incorporates SLD (Special Low Dispersion) glass elements that offer excellent aberration correction. It is exceptional for a lens accessory to use one of the best glass materials, yet this is because SIGMA is seeking for the best image quality, and it is necessary to meet the new SGV standards. It is suitable for professional use since its durable construction is dust and splash-proof. It is compact and light, and provides easy extension of focal range. Special features Incorporating SLD glass elements for better image quality TC-2001 carries 2 SLD (Special Low Dispersion) glass element. By minimizing chromatic aberration effectively, it has achieved very good optical performance, thus it is possible to maintain the optical quality of the original lens. Compatible with lenses of large diameter Its power distribution is designed for lenses of large diameter. Without affecting the lens performance, it offers stable image quality until corners. The rich peripheral brightness enables shooting quality images at every focal length. The durable dust and splash-proof construction is suitable for professional use It is dust and splash-proof, and designed for higher durability. SIGMA 150-600mm F5-6.3 GD OS HSM |Sports and other telephoto lenses are able to meet the demands that professional photographers would require in severe shooting conditions, such as in the rain. AF is effective up to F8 When the new SIGMA Teleconverter is attached to cameras that are compatible with AF at F8, it is possible to shoot with AF. * When shooting subjects with low contrast or luminosity value, focus may not be spot on the subject. Evaluation with SIGMA's own MTF measuring system A1 We used to measure lens performance with an MTF measuring system using conventional sensors. However, we've now developed our own proprietary MTF (modulation transfer function) measuring system (A1) using 46-megapixel Foveon direct image sensors. Even previously undetectable high-frequency details are now within the scope of our quality control inspections. The SIGMA Teleconverter TC-2001 will be checked using this A1 before they are shipped. Other features Ease of use A rubber part is attached to where it mounts with the original lens, and it prevents the devices from scratching each other. It has the same materials and finishing for integrated design as the lenses from the new product lines. * There is difference in the specification from mount to mount. Made in Japan with the best craftsmanship All SIGMA's manufacturing – right down to the molds and parts – is carried out under an integrated production system, entirely in Japan. We are now one of the very few manufacturers whose products are solely made in Japan. We like to think our products are somehow imbued with the essence of our homeland, blessed as it is with clean air and water, and focused, hard-working people. We pride ourselves on the authentic quality of SIGMA products, born of a marriage between highly attuned expertise and intelligent, advanced technology. Our sophisticated products have satisfied professionals and lovers of photography all over the world, because our manufacturing is based on genuine craftsmanship, underpinned by the passion and pride of our experts. Please be advised that the updated version of lens firmware will make it compatible with the new tele converters, however it will also make it incompatible with conventional APO TELE CONVERTER 1.4x EX DG and APO TELE CONVERTER 2x EX DG.