Untitled 1The 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 & 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 & Light Lens BarrelLaowa 25mm f/2.8 2.5-5X Ultra Macro has one of the smallest & lightest barrel of lenses in its class.This allow more light to gather on subject and convenient to use in fields.SpecificationsFocal Length25mmMax. Aperturef/2.8Angle of View10.3 DegreeFormat CompatibilityFull FrameLens Structure8 elements in 6 groupsAperture Blades8Min. Focusing Distance17.3cm (5x) - 23.4cm (2.5x)Working Distance40mm (5x) - 45mm (2.5x)Max. Magnification5xMountsSony FEDimensions3.22 x 2.55" (82 x 65mm)WeightApprox. 14.10 oz (400g)