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Sigma Lists Available lenses for the Four Thirds Standard
http://www.slrtoday.com/articles/183/1/Sigma-Lists-Available-lenses-for-the-Four-Thirds-Standard/Page1.html
By SLR Today
Published on 01/17/2007
 

Sigma today published a list of all Sigma lenses conforming to the Four Thirds standard digital camera system. The Four Thirds system is used by a variety of digital SLR camera's including those recently produced by Olympus, Sigma, Panasonic (Lumix DMC-L1), and Leica (Digilux 3). The standard dictates the size of the lens mount and the distance from the image sensor and lens-camera communication. It also standardizes the sensor size and aspect ratio at 18x13.4mm and 4:3 respectively. The Sigma lenses currently using the Four Thirds system include the:

18-50mm F2.8 EX DC MACRO
18-50mm F3.5-5.6 DC
18-125mm F3.5-5.6 DC
55-200mm F4-5.6 DC
50-500mm F4-6.3 DG
30mm F1.4 EX DC HSM
105mm F2.8 EX DG
150mm F2.8 EX DG

This list can also be found here.

Sigma Lists Lenses Conforming to the Four Thirds System
 
Sigma today published a list of all Sigma lenses conforming to the Four Thirds standard digital camera system. The Four Thirds system is used by a variety of digital SLR camera's including those recently produced by Olympus, Sigma, Panasonic (Lumix DMC-L1), and Leica (Digilux 3). The standard dictates the size of the lens mount and the distance from the image sensor and lens-camera communication. It also standardizes the sensor size and aspect ratio at18x13.4mm and 4:3 respectively. The Sigma lenses currently using the Four Thirds system include the:

18-50mm F2.8 EX DC MACRO
18-50mm F3.5-5.6 DC
18-125mm F3.5-5.6 DC
55-200mm F4-5.6 DC
50-500mm F4-6.3 DG
30mm F1.4 EX DC HSM
105mm F2.8 EX DG
150mm F2.8 EX DG

This list can also be found here.