What's in the box? - Tamron Teleconverter 2.0x for Canon EF - Front and Rear Lens Caps - Lens Case Features: - EF-Mount Teleconverter/Full-Frame Format - 2.0x Magnification Factor - BBAR Coating - Communication Between Lens and Camera - Maintains Metering and VC - Dust and Moisture-Resistant Construction - Compatible with SP 150-600mm G2 Lens Specifications: - Magnification: 2.0x - Lens Elements/Groups: 9 elements in 5 groups - Light Loss: 2 stops - Dimensions: 2.75 x 2.6" / 69.8 x 66.8 mm - Weight: 12.7 oz / 360.0 g Packaging Info - Package Weight: 1.35 lb - Box Dimensions (LxWxH): 5.4 x 5.3 x 4.6" Extending the effective focal length of the Tamron SP 150-600mm f5-6.3 Di VC USD G2 lens, this Canon EF-mount Teleconverter 2.0x renders this telephoto zoom as a 300-1200mm f/10-14 lens. The dedicated design retains communication between the lens and Canon EF-mount cameras, including auto-exposure metering and Vibration Compensation image stabilization, and both one low dispersion element and a BBAR coating has also been incorporated to maintain image quality. Additionally, this teleconverter also features a dust- and moisture-resistant construction, matching the lens, to benefit working in harsh environmental conditions. - 2.0x teleconverter doubles the reach of

150-600mm lens with only a two-stop loss in exposure. - One low dispersion element is included in the optical design to reduce chromatic aberrations and color fringing. - BBAR coating maintains image quality by reducing flare, reflections, and ghosting. - Dedicated design retains electronic communication between the lens and camera to support AE and VC functions. - When attached to the SP 150-600mm f/5-6.3 Di VC USD G2 lens, the maximum magnification will change from 1:3.9 to 1:2. - Weather-resistant design matches the construction of the 150-600mm lens itself for use in inclement conditions.