Brochure

8
ABOUT OUR LENS
Note 1: The angle of view varies depending on which camera the lens is mounted on. To nd the 35mm camera-equivalent focal length, multiply the DC lens focal length by the crop factor (digital multiplier) of 1.5-2,
depending on the brand of DSLR camera on which the lens will be used.
Note 2: Vignetting will occur when DC lenses are used on digital cameras having image sensors larger than APS-C size.
To nd which DC lens is equivalent to a full-frame lens, divide the focal length of the full frame lens by the same crop factor.
Lens categories for all major standards
For our three product lines, SIGMA develops lenses optimized for 35mm full-frame, APS-C,
and mirrorless interchangeable lens cameras.
SIGMA DN LENSES
1
Lenses for mirrorless interchangeable lens cameras
These lenses are designed for exceptional performance on mirrorless inter-
changeable lens cameras with a short ange back distance.
Lenses exclusively for mirrorless interchangeable lens cameras with
full-frame sensors
The SIGMA I series features full-frame compatible lenses that offer mirrorless
users a new and better alternative, both in the experience of shooting with the
lens and in the impressive results it is able to achieve.
SIGMA has given careful thought how photographers use and enjoy their
lenses, including optical design, advanced functionality, build quality and the
experience of picking up and using the lens, and with all of this carefully con-
sidered, the I series was born.
SIGMA DC LENSES
1, 2
Lenses for cameras with APS-C sensors
These lenses are designed especially for cameras with APS-C sensors. The
smaller image size makes possible a compact, lightweight format that offers
outstanding exibility and maneuverability.
SIGMA DG LENSES
Lenses for cameras with full-frame sensors
Designed to deliver the ultimate in performance on cameras with full-frame
sensors, these lenses also bring out the best from APS-C sensor cameras.
EX LENS
SIGMA’s professional-grade prime
lenses and wide-aperture zoom lenses
that maintain their maximum F-number
regardless of zoom position.
EX
HYPER-SONIC MOTOR
Using a motor driven by ultrasonic waves,
these lenses offer speedy autofocusing
and quiet operation.
HSM
*
ASPHERICAL LENS
Aspherical lenses offer greater design
latitude, raise performance, permit use
of fewer lens elements, and allow a
more compact size.
ASP
INNER FOCUS
To increase stability, this lens con-
figuration uses movable internal lens
elements that adjust focus without
changing the length of the lens barrel.
IF
LOW DISPERSION LENS
These lenses include one or more ele-
ments made of ELD (Extraordinary Low
Dispersion), FLD (“F” Low Dispersion),
or SLD (Special Low Dispersion) glass,
which help minimize chromatic aberra-
tion, which can harm image quality.
ELD/FLD/SLD
REAR FOCUS
Rear focus is one type of SIGMA inner
focus system, in which focusing is per-
formed by moving particular elements
within the lens interior.
RF
OPTICAL STABILIZER
An Optical Stabilizer mechanism built
into the lens helps assure a sharp image
while giving you freedom of movement
and more latitude in camera settings.
OS
*
TELECONVERTER-COMPATIBLE LENS
This indicates a lens that will accept
available SIGMA TELE CONVERTER
(optional) attachments, which increase
focal length and support AE (automatic
exposure) operation.
CONV
*Note: OS and HSM are not included on mounts for certain camera systems. Please refer to the major distinguishing characteristics on 36-39 page.
Abbreviations used in this catalog to indicate function
FUNCTION