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to reinforce its strength is applied to the surface giving it greater strength and making it highly resistant to long-term
use.
Newly developed “USB DOCK” exclusively for new product lines
Attaching the lens to an optional USB DOCK plugged to your computer and using dedicated software “SIGMA
Optimization Pro”, you can update the lens firmware and adjust parameters such as focus.
Evaluation with Sigma’s own MTF measuring system “A1”
We used to measure lens performance with MTF measuring system using conventional sensors. However, we've now
developed our own proprietary MTF (modulation transfer function) measuring system, called 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 24-105mm F4 DG OS HSM will all be checked using this “A1”
before they are shipped.
“Made in Japan”
All Sigma’s manufacturing processes- right down to molds and parts, with a few exceptions, are carried out under a
single integrated production system entirely 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.
Applicable for the Mount Conversion Service
As an experienced lens manufacturer that has been creating a diverse range of interchangeable lenses, we are proud to
introduce a new paid service “Mount Conversion Service” (starting from September 2nd, 2013)*. With this service,
the mount of your current SIGMA lenses can be changed to another mount of your choice. It gives a new life to your
favorite lenses when you wish to use it on a different camera body.
* This “Mount Conversion Service” is different from a normal repair. In order to apply for the service, please contact your nearest authorized subsidiary /
distributor of SIGMA.