Sony FE 1.4x Teleconverter (SEL14TC) Case Extending the effective focal length of select Sony E-mount telephoto lenses, the FE 1.4x Teleconverter increases the lens's magnification by 1.4x for a narrower field of view. The dedicated design maintains full communication between the lens and E-mount mirrorless cameras, including auto-exposure metering, autofocus, and Optical SteadyShot image stabilization. Additionally, this teleconverter also features a dust- and moisture-resistant construction, matching the lens, to benefit working in harsh environmental conditions. E-Mount Teleconverter/Full-Frame Format 1.4x Magnification Factor Communication Between Lens & Camera Maintains Metering, Autofocus, and OSS Dust and Moisture Resistant Compatible with Select Sony Lenses