The most compact and versatile high magnification macro lens.This lens is optimized for macro shooting between 2.5X - 5X life size. The lens is specially designed with an extended working distance (45mm at 2.5x and 40mm at 2x)and smaller lens barrel. This allow a sufficient lighting on the object for easier shooting in the field. The lens is much more compact and lighter than other comparative products. This lens also provides a relatively greater depth of field compared to other extreme macro lens in the market. The Laowa 25mm f/2.8 2.5-5X is developed for both professional and leisure macro photography, to be used on the field or in indoor set-up.FeaturesExtended Working DistanceCarefully designed to extend the short working distance of traditional 25mm lens in order to provide sufficient room for lighting hitting the subject.40mm 5:1 - 45mm 2.5:1Superb Optical Performance8 elements in 6 groups with an extra low dispersions elements to deliver an unprecedented corner to corner sharpness.Small and Light Lens BarrelLaowa 25mm f/2.8 2.5-5X Ultra Macro has one of the smallest and lightest barrel of lenses in its class. This allows more light to gather on subject and convenient to use in fields..