| 50mm f/1.4 EX DG HSM | |
| Key features | |
|---|---|
| Maker: | Sigma Corporation |
| Image stabilization: | No |
| Ultrasonic motor: | Yes |
| Short back focus: | No |
| Macro capable: | No |
| Application: | normal prime/portrait |
| Technical data | |
| Focal length: | 50mm |
| Aperture (max/min): | f/1.4 - f/16 |
| Construction: | 6 groups / 8 elements |
| # Diaphragm blades: | 9 |
| Close focus distance: | 45 cm / 17.7 in. |
| Max. magnification: | 1:7.4 |
| Physical | |
| Max. diameter: | 84.5 mm / 3.3 in. |
| Max. length: | 68.2mm / 2.7 in. |
| Weight: | 505 g / 17.8 oz. |
| Filter diameter: | 77 mm |
| Accessories | |
| Lens hood: | Petal |
| Angle of view | |
| Diagonal: | 45.8° |
| History | |
| Introduced: | 2008 |
| Retail info | |
| MSRP US$ | $730.00 USD |
The Sigma 50mm f/1.4 EX DG HSM is a normal prime lens made by the Sigma Corporation.
The lens is produced in Canon EF mount, Four Thirds System, Nikon F-mount, Pentax K mount, Sigma's own SA mount, and the Sony/Minolta AF Mount varieties, all have the same optical formula.
Contents |
The Sigma 50mm f/1.4 EX DG HSM is constructed with a plastic body and a metal mount. This lens features a distance window with depth of field scale. A 9-blade, maximum aperture of f/1.4 gives this lens the ability to create shallow depth of field effects. The optical construction of this lens contains 8 lens elements, including one aspherical lens element. This lens uses a front extension focusing system, powered by a ring USM motor. Auto focus speed of this lens is moderate; it's not as fast as most ring USM lenses. The front of the lens does not rotate, but does extend when focusing. The lens is designed so that the outer body barrel is longer than the inner lens barrel, when the inner lens barrel is at its longest extension. This results in the lens maintaining the same overall length no matter where the point of focus lies.[1]
When used on a digital crop body with a field of view compensation factor of 2x (Four Thirds body) it provides a field of view equivalent to an 100mm lens mounted in a 35mm body. In a 1.6x body, such as the Canon EOS 7D, it provides a narrower field of view, equivalent to an 80mm lens mounted on a 35mm frame body. With a 1.5x body such as the Nikon D300 It provides a less narrow field of view, equivalent to an 75mm lens mounted on a 35mm frame body. With a 1.3x body such as the Canon EOS-1D Mark III It provides an even less narrow field of view, equivalent to an 65mm lens mounted on a 35mm frame body.
This lens has shown to have lower vignetting than other Canon 50mm lenses.[2] It has been reported that quality control problems lead to some copies of this lens having problems attaining proper focus when using auto focus.[3]
Noted Nikon blogger Thom Hogan has given a largely positive review of the lens on his website, bythom.com.
http://www.bythom.com/Sigma-50-HSM-lensreview.htm
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