The Sony Sonnar T FE 55mm f1.8 ZA Lens is a prime normal focal length lens featuring a very fast and bright f1.8 maximum aperture to support working in dimly-lit conditions and for greater control over focus for shallow depth of field imagery. The sophisticated Sonnar optical design enables high resolution and sharpness with optimized low-light shooting capabilities. A Carl Zeiss T anti-reflective coating has also been applied to lens elements to reduce lens flare and ghosting for improved contrast and color fidelity.Additionally a dust- and moisture-resistant construction ensures this lens use in tough environmental conditions.