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Sony SEL20TC 2.0X Teleconverter

Teleconverter for compatible Sony E-mount lenses

2 Reviews


Our take on the Sony SEL20TC 2.0X Teleconverter

Double your reach

If you shoot sports or wildlife, sometimes a little extra reach makes all the difference in getting the winning shot. Sony's SEL20TC 2.0X teleconverter is a lightweight, compact alternative to lugging around a bulky extra lens. Attached between your Sony E-mount camera body and a compatible lens, it doubles the lens's effective focal length without degrading image resolution. This converter is currently only compatible with Sony's SEL70200GM 70-200mm zoom lens, and will increase its zoom range to 140-400mm on full-frame E-mount cameras. On APS-C sensor E-mount cameras, the equivalent focal length is 210-600mm — some serious telephoto reach.

Product Highlights:

  • currently only compatible with Sony SEL70200GM 70-200mm zoom lens
  • provides 2.0X optical magnification
  • light loss: 2 f-stops
  • retains full optical quality and operability of lens
  • construction: 8 elements in 5 groups
  • 1 aspherical lens element for excellent image quality
  • includes case
  • teleconverter is 2-1/2" in diameter, 1-11/16" long
  • weight: 7.3 oz.
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the Box:

  • Sony E-mount 2.0x teleconverter
  • ALC-B1EM Body lens cap
  • ALC-R1EM Rear lens cap
  • Zippered storage case
  • Operating Instructions
  • Precautions before Using
  • Notes on Use
  • Limited Warranty (US)
  • European Guarantee Information Document

Sony SEL20TC 2.0X Teleconverter Reviews

Average Customer Review(s):

(2 Reviews)

Sony SEL20TC 2.0X Teleconverter

Les from Camillus, NY on 5/22/2018

Crutchfield Customer Review (What's this?)

I love it

Pros: Perfect extension of my eyes


One Step Beyond

Gary from Custer, SD on 3/20/2018

Crutchfield Customer Review (What's this?)

This Teleconverter marries perfectly with my G Master 100-400mm lens, without any change in auto focus speed, and virtually no degrading of image. Just what the doctor ordered for reaching out to capture far away subjects, or getting that close up head shot. Great price and great service from Nate and the crew at Crutchfields (as always).

Pros: Image quality, auto focus speed, and convenience.

Cons: None


Hands-on research

Product Research


Overview: The Sony 2.0x Teleconverter (SEL20TC) increases the focal length of the attached lens by 2.0 times, when mounted between the camera and the lens. The teleconverter is compatible with Sony α series E-mount cameras, and is recommended for full-frame cameras. It cannot be used on Sony A-mount cameras, or with any mount adapters. It is currently only compatible with the Sony SEL70200GM lens. The 2.0x Teleconverter comes with front and rear lens caps and a zippered storage case.

Construction: The 2.0x teleconverter features 8 lens elements in 5 groups, including one aspherical lens element.

Teleconverter Attributes: The teleconverter multiplies the focal length of the lens used without degrading its optical performance, auto-focus speed and precision, or operability. It allows you to extend the focal length so you don't have to carry additional large, heavy lenses. Attaching the teleconverter changes the f-stop, maximum magnification, and depth-of-field specifications of the lens:

  • F-stop: 2 f-stops higher (slower) than the attached lens
  • Maximum Magnification: 2.0x the attached lens
  • Depth of Field: approximately 1/2 of the attached lens


  • Dimensions: Diameter - 2.452", Length - 1.66" (2.029" w/lens caps)
  • Weight: 7.4 ounces

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

I already own the Sony G-Master 100-400mm lens, and this mates with it perfectly to increase my telephoto focal length. [ GARY  Mar 05, 2018 ]
need it for 100-400 GM sony FE kit [ David  Jul 29, 2017 ]