This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com 41mm Equivalent.Filter size ø39mm Slim and compact at 2.75oz Super EBC coating (Electron Beam Coating) Lens configuration :7 elements in 5 groups(includes 1 aspherical element)