
The Sony SEL20TC teleconverter doubles the focal length of your lens, so you can get even more out of your telephoto lenses. The teleconverter affects the aperture by two stops. With the Sony teleconverter, all features such as exposure metering, autofocus and image stabilization work normally.
On the Sony a9 body, phase-detection PDAF works even with the 100-400mm G Master zoom and this teleconverter.

The Sony SEL20TC is also weather and dust-proof, so it can withstand similar use as Sony telephoto lenses and bodies like the a7 and a9.
There is also a 1.4x magnification version of the teleconverter, the SEL14TC.
Specifications:
Compatibility: Sony E-Mount (E and FE)
Dust and moisture protected
Optical construction: 8 elements in 5 groups
Length: 42.7 mm
Diameter: 63.5 mm
Weight: 207g
The sales package includes a storage bag.