Sigma 180mm f/3.5 EX APO DG Macro IF HSM - Sigma SA, Canon EF, Nikon F, Sony A, Pentax K Mount

The Sigma 180mm f/3.5 EX APO DG Macro IF HSM is an updated version of the 180mm macro, featuring DG coatings to reduce flare and ghosting when used with digital sensors. It maintains the 1:1 magnification ratio and the long working distance that makes it highly effective for macro photography. The lens construction includes SLD (Special Low Dispersion) glass to correct chromatic aberrations, while the HSM motor ensures quiet autofocus operation. When sourcing a used DG model, ensure the tripod collar is present and functioning correctly, as this is essential for stable macro work. The focus limiter switch should be tested to confirm it correctly restricts the focus range for faster acquisition. SDS examines the internal elements for 'blooming' or dust and ensures the HSM system is functioning within factory tolerances, particularly on older mounts like Canon EF.