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Brass made bayonet mount
This lens incorporates a brass made bayonet mount which has both high accuracy and durability. A
special treatment to reinforce its strength is applied to the surface giving it greater strength and
making it highly resistant to long-term use.
Ease of use
The new product lines incorporate rubber for the attachment part of the provided lens hood. For better
usability, the design of the lens cap and AF / MF changeover switch has been improved.
Newly developed “USB DOCK” exclusively for new product lines
Based on these new lines, we have developed special software (SIGMA Optimization Pro) that 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 (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
17-70mm F2.8-4 DC MACRO OS HSM will all be checked using this “A1” before they are shipped.
“Made in Japan”
All Sigma's manufacturing – right down to 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.