The lens optical construction comprises of 9 lenses divided into 7 optical groups with one aspheric lens element. The Samyang 85mm is designed with internal focusing (IF) meaning the lens does not increase in size when focusing. A further positive aspect to internal focusing is that the lens is much less likely to get dust inside.

An aperture control motor and CPU chip is installed within 85mm F1.4 AS UMC Canon AE lens to assist Auto Exposure(AE) for Canon cameras. The aperture can be controlled from camera body thanks to the motor and chip. Also the appropriate focus is guided with indicator light. 

The Samyang 85 mm F1.4 lens should be a serious consideration to all professional or amateur photographers in need of a fast yet intricate prime lens at a reasonable price. Supplied with front and rear lens caps, lens hood and a soft lens pouch. Filter size 72mm