The 135mm f/2.8 Smooth Transition Focus Lens from Sony is a manual focus prime lens that uses Sony's Smooth Trans Focus (STF) technology for a very unique effect on defocused light sources, changing the way defocused areas appear depending on how it is adjusted. The lens is constructed of 8 elements in 6 groups which all help to deliver sharp, clear photos. It has a minimum focusing distance of 2.9' and a front-end filter diameter of 72mm.
| Performance | |
|---|---|
| Focal Length |
135 mm Comparable APS-C Focal Length: 202.5 mm |
| Aperture |
Maximum: f/2.8 Minimum: f/31 |
| Camera Mount Type | Sony Alpha, Minolta AF |
| Format Compatibility |
35mm Film / Full-Frame Digital Sensor DSLR (APS-C Sensor) |
| Angle of View |
18° APS-C Picture Angle: 12° |
| Minimum Focus Distance | 2.85' (87 cm) |
| Magnification | 0.25x |
| Maximum Reproduction Ratio | 1:4 |
| Groups/Elements | 6/8 |
| Diaphragm Blades | 9 |
| Features | |
|---|---|
| Image Stabilization | No |
| Autofocus | No |
| Tripod Collar | No |
| Physical | |
|---|---|
| Filter Thread | Front: 72 mm |
| Dimensions (DxL) | Approx. 3.15 x 3.90" (8.00 x 9.9 cm) |
| Weight | 1.61 lb (730 g) |