Tamron TC-X20 Canon 1Dx 14 elements in 10 groups

14 elements in 10 groups (includes 4 aspherical and 3 extra low dispersion elements)

An Ultra Multi-Coating has also been applied

aperture F4

For long days of travel when you don't want to carry the bag at all

but also has a dust and splash proof design

Tamron TC-X20 Canon 1Dx 14 elements in 10 groupsTamron Teleconverter 2. 0x Front and Rear Lens Caps Lens Case Extending the effective focal length of the Tamron SP 150 600mm f5 6. 3 Di VC USD G2 lens, this Nikon F 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 Nikon F mount cameras, including auto exposure metering and Vibration Compensation image stabilization, and both one low dispersion element