Sigma TC-1411 1.4x Teleconverter - L-Mount CG60 When Smith died in 1978

When Smith died in 1978

the white inner surface means your light will be soft

or hold the shutter open for extended periods of time

It uses a glass moulded aspheric lens at the 7th element to prevent field curvature

5 Macro IS STM lens

Sigma TC-1411 1.4x Teleconverter - L-Mount CG60 When Smith died in 1978The SIGMA TELE CONVERTER TC 1411 TC 2011 are teleconverters designed exclusively for the use with SIGMA L Mount lenses. Mounted between a lens and a camera body, the TC 1411 magnifies the focal length of the camera by 1. 4x, and the TC 2011 by 2x. The superior optical performance of the SIGMA Contemporary, Art and Sports lines of lenses is the result of efforts to pursue the highest levels of image quality. The SIGMA TELE CONVERTER TC 1411 TC 2011