Sigma 120-400mm f/4.5-5.6 DG OS HSM lens

{{Short description|Sigma lens}}

{{Infobox photographic lens

| name = APO 120-400mm F4.5-5.6 DG OS HSM[http://www.sigma-photo.co.jp/english/lens/tele/120_400_45_56.htm APO 120-400mm F4.5-5.6 DG OS HSM/APO 120-400mm F4.5-5.6 DG HSM]

| image = Sigma 120-400mm 03.jpg

| maker = Sigma

| feat-is = y

| focusdrive = Ultrasonic motor

| feat-sbf = n

| feat-macro = n

| feat-special =

| type = Telephoto zoom

| application =

| flength = 120-400mm

| fov = 1.0

| aperture = {{f/}}4.5-5.6-{{f/}}22

| groups = 15

| elements = 21

| diaphragm = 9

| close-dist = 150cm

| max-mag = 1:4.2

| weight = 1640g

| max-diameter = 92.5mm

| max-length = 203.5mm

| filter = 77mm

| hood =

| av-horiz =

| av-vert =

| av-diag =

| start =

| msrp = $852.33

}}

The Sigma APO 120-400mm F4.5-5.6 DG OS HSM lens is a super-telephoto lens produced by Sigma Corporation. It contains three SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration. It is aimed toward advanced consumers.