Specification Brand : OPTURA HD OPTICS BulletPoint1 : 2.0x magnification factor BulletPoint2 : Elements/Groups 5 BulletPoint3 : Mount EF BulletPoint4 : When using a teleconverter, you lose some amount of light, typically around 1-2 stops depending on the specific teleconverter. This means you'll need to compensate by either using a slower shutter speed, a higher ISO, or a wider aperture to maintain proper exposure. Additionally, teleconverters can sometimes degrade image quality slightly, particularly in terms of sharpness and contrast. BulletPoint5 : Focal Length & Maximum Aperture Magnification: 2.0x Color : WHITE CompatibleMountings : Canon EF FocalLengthDescription : 2X TELECONVERTER FocusType : Auto Focus IncludedComponents : 2X TELECONVERTER ItemName : 2X HD 32K WHITE LINE CONVERTER for Canon EF 70-200mm f/4L USM Lens 140-400MM ItemPackageQuantity : 1 ItemTypeKeyword : camera-lens-adapters LensDesign : Prime Manufacturer : OPTURA HD OPTICS MaxAperture : 2 f_stop MaxFocalLength : 135 millimeters MinAperture : 2 f_stop MinFocalLength : 135 millimeters NumberOfItems : 1 PartNumber : W-OP-2X ProductDescription : A 2X teleconverter, also known as a teleconverter or tele-extender, is a lens accessory used in photography to increase the focal length of a lens. It effectively magnifies the focal length of the lens by a factor of 2x, hence the name "2X teleconverter". For example, if you attach a 2X teleconverter to a 100mm lens, it will effectively turn it into a 200mm lens. This can be useful for getting closer shots of distant subjects without needing to invest in a longer lens. However, there are some trade-offs involved. ProductSiteLaunchDate : 2024-03-28T02:53:42.320Z SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 WarrantyDescription : 1 YEAR ZoomType : Extended Optical Zoom