The Zeiss 1677838 short telephoto is a classic portrait focal length which is further enhanced by the long barrel rotation for precise control of the focus point in the image. The Planar T* 1.4/85 is optimized for medium to longer distances and provides distortion-free performance which only improves as the lens is stopped down. The fast f/1.4 aperture is very useful for creatively controlling the depth of field and the nearly circular diaphragm creates a pleasing 'bokeh' in the out-of-focus areas. Combined with a DSLR with a 1.5 crop factor the lens becomes a focal length of 128 mm.
- The lens' shallow depth of field at wide apertures allows the use of selective focus. This helps to emphasize the primary subject by defocusing the background.
- The 9-blade circular aperture produces a smooth and natural rendition of defocused images as well as nearly circular shapes of point sources of light.
- Geometrical distortion is imperceptibly low allowing high quality documentation photographs both analog and digital.
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