Sigma 18-50mm

[Brianbar]

Does anybody have any experience on this Sigma lens released last October.
Sigma today announced two new lenses designed specifically for digital SLR APS sensor size. The 18 - 50 mm F3.5 - 5.6 DC and 55 - 200 mm F4.5 - 5.6 DC lens can be made considerably smaller and lighter because they are designed to produce an image circle specifically large enough for an APS size sensor (all current digital SLRs except the Canon EOS-1D/1Ds and Kodak DCS-14n). Both lenses are notably lighter and more compact than 35 mm equivalents. Used on the Sigma SD9 or SD10 these new lenses would provide an equivalent field of view of 30 - 85 mm and 93 - 340 mm respectively.

Press Release:

Sigma 18-50mm F3.5-5.6 DC

Thanks
Brian

[maderito]

Sigma now has a faster 2.8 version of this lens:


Press Release [quoted from DP Review (http://www.dpreview.com/news/0407/04072001sigma1850dc.asp)]
Sigma 18-50mm F2.8 EX DC

Sigma has today announced a further extension to its range of DC lenses which are designed specifically for digital SLR's. The new 18-50 mm F2.8 EX DC has a very usable 18 mm wide angle (approx 28 mm FOV on a digital SLR) to 50 mm telephoto (approx. 2.7x zoom). Like all DC lenses the image circle produced by this lens is designed to be just the right size for APS size sensors and hence allows the lens to be more compact than it would otherwise be.

...

Sigma 18-50mm F2.8 EX DC lens specifications
Focal length 18 - 50 mm
Minimum aperture F22
Lens construction 15 elements in 13 groups
Angle of view 69.3° - 27.9°
Number of diaphragm blades 7 pieces
Minimum focus distance 28 mm (11 in)
Maximum magnification 1:5
Filter size 67 mm
Hood Petal-type hood
Dimensions (Dia x Len) 74.1 x 84.1 mm (2.9 x 3.3 in)
Weight 445 g (15.6 oz)


These specs are very close to the Canon 17-40 f/4 L in terms of size and weight. The 2.8 f-stop for the Sigma matches the much more expensive Canon 16-35 f/2.8 L. The Sigma will undoubtedly be cheaper than both Canon lenses.

It will be interesting to see if this Sigma lens competes with the Canon lenses. Because of its APS format, the lens is of no use to our forum friends who have invested in one or more ( :shock: ) of the Canon 1Dx series cameras.

[Alexandre Gabriel]

Will this lens fit EF mount?
Is it fully compatible with 1.6 EOSs?

[roanjohn]

Will this lens fit EF mount?
Is it fully compatible with 1.6 EOSs?

Yes!!

Ro1