The Sigma 28mm EX-DG-Asp-Macro-f/1.8 AF Lens has been designed keeping the high demands of the industry in mind.

• The maximum aperture of the lens is equal to f1.8
• The lens construction includes 10 elements in 9 different groups
• The f stop range is from f1.8-f22  and the angle of view is 75.4°
• The filter size of the lens is 77mm
• The lens’ reproduction ratio is 1:2.9
• Some of the features of this Sigma wide angle lens include fixing extra light, control aberrations, and automate focusing
• The closest focusing distance of this Sigma 28mm F/1.8 Lens is 7.9 inches and the full extended length is 3.5 inches
  

Lens Construction: 10 Elements in 9 Groups
Angle of View: 75.4º
Number of Diaphragm Blades: 9
Mininum Aperture: f22
Minimum Focusing Distance: 20 cm / 7.9 in
Filter Size (mm): 77
Maximum Magnifications: 1:2.9
Dimensions (Diameter x Length): 83.5 x 80 mm/3.3 x 3.1 in
Extended Dimensions: 88.9 mm / 3.5 in
Weight: 480g / 16.9oz.
Corresponding Mounts: Sigma ASP EX DG, Nikon ASP EX DG D, Canon ASP EX DG, Sony/Minolta ASP EX DG D, Pentax (3)ASP EX DG