These Samyang 85 mm F1.4 AS IF UMC aspherical lenses feature new UMC (Ultra Multi Coatings) which aid the very high level of light transmission, and add further resistance to flare and ghosting. The 85 mm F1.4 lenses are manual focus primes, designed to give exceptional results at wide apertures. At F1.4 great images can be obtained, which is perfect for portraiture and low light shooting. The Samyang 85 mm is also suited to cropped sensors, including APS-C / DX sensors, it gives approximately 120 mm focal length equivalent. Coupled with the fast F1.4 aperture gives an excellent portrait lens for tighter head shots or working from a distance with cropped sensor cameras, or for shooting in various low light conditions. The bokeh (the character of the out-of-focus blur) is a primary concern for professionals choosing an ultra large aperture lens for shallow depth-of-field photography. The Samyang 85 mm F1.4 lens design offers excellent bokeh quality of out-of-focus highlights when used near wide open such as at F1.4 and F2. The lens optical construction comprises of 9 lenses divided into 7 optical groups with one aspheric lens element. The Samyang 85 mm 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.