Sigma 30mm f/1.4 EX DC HSM lens

Sigma 30mm f/1.4 EX DC HSM

Maker	Sigma Corporation
Technical data
Focal length	30 mm
Aperture (max/min)	f/1.4 - f/16
Close focus distance	40cm / 15.7in
Max. magnification	1:10.4
Diaphragm blades	8
Construction	7 elements / 7 groups
Features
Short back focus	No
Ultrasonic motor	Yes (not available with Pentax and Sony mount)
Lens-based stabilization	No
Macro capable	No
Application	interiors/portrait
Physical
Max. length	59mm / 2.3in
Diameter	75.5mm / 2.9in
Weight	430g / 15.2oz.
Filter diameter	62mm
Accessories
Lens hood	Petal Hood
Angle of view
Horizontal	43.6(1.5x), 41.1 (1.6x)
Vertical	29.9 (1.5x), 28.1 (1.6x)
Diagonal	51.4(1.5x), 48.5 (1.6x)
History
Introduction	2006

Sigma 30mm f/1.4 EX DC HSM mounted on a Canon EOS 40D, hood attached.

The Sigma 30mm f/1.4 EX DC HSM is a wide-aperture photographic lens made by the Sigma Corporation, equipped with Hyper Sonic Motor (abbreviated HSM, Sigma's trade name for photo lens focusing technology using ultrasonic motor). The lens was produced in Canon EF mount, Four Thirds System, Nikon F-mount, Pentax K mount, the SA mount, and the Sony/Minolta AF Mount varieties, all of the same optical formula. It shipped with a removable petal-type lens hood (62mm diameter). The lens assumes a crop factor of roughly 1.5, and therefore is not usable with on full-frame or 135 film cameras.

In 2013, Sigma announced that the lens would be replaced by a redesigned model designated as the Sigma 30mm f/1.4 DC HSM A; the new lens went on sale in March of that year in Canon, Nikon, and Sigma mounts.^[1]

Its large aperture allows for a shallow depth of field, allowing good isolation of close subjects. On APS-C sensor cameras, its field of view equivalent to that of a 46mm lens (Nikon DX, Pentax, Sony, current Sigma bodies), 48mm lens (Canon), 51mm lens (older Sigma bodies) or 60mm lens (Four Thirds). On the Four-Thirds mount, it is the only affordable normal, large aperture lens, therefore it is popular lens on that format.

Optical properties

Center resolution

The Sigma 30mm f/1.4 EX DC HSM lens has unusual optical properties. With most photographic lenses, vignetting is drastically reduced by stopping down the aperture by about 1 f-stop. This lens has a more linear response to stopping down the aperture. To reduce vignetting by about one half, it is required to stop down the aperture by over 3 full f-stops. The optical resolution properties of this lens are also unique. Most lenses are typically sharp in the center of the image frame, and softer in the edges. This problem is typically solved by stopping down the lens. This lens has little response to such an effort. When stopped down by over 4 stops, the edges of the frame are still soft. However, the center resolution of the lens is high when used wide open, and becomes exceedingly high when the lens is stopped down.^[2][3]

See also

• List of Nikon compatible lenses with integrated autofocus-motor

References & External links

1. "Sigma Corporation announces pricing and availability for 30mm F1.4 DC HSM, 30mm F2.8 DN and 19mm F2.8 DN lenses" (Press release). Sigma Corporation of America. March 8, 2013. Retrieved July 25, 2013.
2. www.photozone.de - Test Report/Review
3. the-digital-picture.com - Sigma 30mm f/1.4 EX DC HSM Lens Review

• Sigma 30mm F1.4 EX DC HSM page on the corporate website.
• Sigma 30mm F1.4 EX DC HSM image samples on pbase.com

External links