PLEASE BE ADVISED THAT THIS MODEL NEEDS TO BE PRE-ORDERED AND HAS AN ORDER LEAD-TIME OF APPROXIMATELY 2-4 WORKING DAYS. Warranty: 12 Months Manufacturer Warranty Specification: Lens construction: 10 Elements in 6 Groups, including ED Lens Elements Angle of View: 180 Degree Closest Focusing Distance: 0.135m Maximum Image Magnification: 0.22x (35mm equivalent Maximum Image Magnification 0.44x) Minimum Field Size: 75x132 mm Number of Blades: 7 (Circular aperture diaphragm) Maximum Aperture: f 3.5 Minimum Aperture: f 22 Dimension: Diameter 79 x 77 mm