The Sigma TC-1401 is a high standard 1.4x tele-converter that is
designed specifically for Sigma's Global Vision product lines. By
mounting it in between a telephoto lens and a camera, the offered
magnification of focal length is increased by 1.4 times. The Tele
Converter incorporate SLD (Special Low Dispersion) glass elements that
offer excellent aberration correction. It is unusual for a lens
accessory to use one of the best glass materials, yet this is because
Sigma is seeking for the best possible image quality, and it is
necessary to meet the "SGV" standards. The dust and splash proof
construction ensure this tele-converter is suitable for professional. It
is compact and lightweight and provides an easy extension of focal range.
The TC-1401 incorporates 1 SLD (Special Low Dispersion) glass element.
By minimising chromatic aberration effectively, it has achieved
excellent optical performance, thus it is possible to maintain the
optical quality of the original lens.
Its power distribution is designed for lenses of a large diameter.
Without affecting the lens performance, it offers stable image quality
even to the corners. The rich peripheral brightness enables shooting
quality images at every focal length. When the TC-1401 is attached to
cameras that are compatible with AF at F8, it is possible to shoot with
The TC-1401 is dust and splash-proof and designed for higher durability.
The SIGMA 150-600mm F5-6.3 DG 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. 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
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 TELE CONVERTER TC-1401 will all be checked using
this "A1" before they are shipped. All Sigma's manufacturing - right
down to the moulds 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.