Sigma 18-35mm f/1.8 DC HSM A

{{Infobox photographic lens

|name = Sigma 18-35mm f/1.8 DC HSM A

|image = Sigma 18-35mm F1.8 DC HSM Art.jpg

|caption =

|maker = Sigma Corporation

|focusdrive = Hypersonic motor

|feat-is = n

|feat-special = Art series; 5 SLD glass elements, 4 glassmold aspherical elements, wide aperture

|application = Standard zoom

|type = z

|flength = 18-35mm

|flength-eq = 27-52.5mm

|fov =

|aperture = f/1.8 - f/16

|groups = 12

|elements = 17

|diaphragm = 9, rounded

|close-dist = {{convert|0.28|m|ft}}

|max-dist = Infinity

|max-mag = 0.23

|max-diameter = {{convert|78|mm|inch}}

|max-length = {{convert|121|mm|inch}}

|weight = {{convert|810|g|lb}}

|filter = 72mm

|hood = LH780-03

|start = 2013

|stop =

|replace =

|msrp =

}}

The Sigma 18-35mm f/1.8 DC HSM Art lens is a fast, constant-aperture wide standard zoom lens made by Sigma Corporation. It was announced April 18, 2013.

This lens, at its time of manufacturing, was the only standard zoom with a constant f/1.8 aperture. The lens was designed specifically for crop body{{clarify|reason=What is a crop body?|date=December 2016}} DSLRs enabling a crop factor adjusted (full frame equivalent) of f/2.88 for Canon or f/2.7 for Nikon crop body DSLRs across an equivalent range of 28mm-56mm (Canon full frame adjusted) or 27mm-53mm (Nikon full frame adjusted).

In the year of its introduction, the lens won an EXC!TE award[https://web.archive.org/web/20150701100016/http://www.reuters.com/article/2013/08/15/ny-sigma-corporation-idUSnBw155582a+100+BSW20130815 Reuters] and was named Lens of the Year at the Camera Grand Prix.{{Cite web|url=http://www.dpreview.com/articles/5034835494/cjpc-camera-grand-prix-2013-sony-cybershot-dsc-rx1-sigma-35mm-f1-4-dg-hsm|title=Sony RX1 wins Camera Grand Prix 2013, Sigma 35mm F1.4 lens of the year}}