Sigma unveil more Four Thirds lenses

[Matt]

The Sigma Corporation is pleased to announce the launch of four new lenses for the Four Thirds System.


• 18-50mm F2.8 EX DC MACRO
• 24mm F1.8 EX DG ASPHERICAL MACRO
• 135-400mm F4.5-5.6 APO DG
• 300-800mm F5.6 EX DG APO HSM

The new Sigma lens line-up for the Four Thirds system comprises the large aperture wide-angle 24mm F1.8 EX DG ASPHERICAL MACRO, the compact telephoto zoom lens APO 135-400mm F4.5-5.6 DG, the large aperture ultra-telephoto zoom lens 300-800mm F5.6 EX DG HSM and the large aperture zoom lens 18-50mm F2.8 EX DC MACRO.

The introduction of these new lenses increases our lens line-up for Four Thirds mount to a total of eleven models

more details to follow

 

[Joe T]

300-800 on 4/3rds? Woah! Thats a 2x focal length factor isnt it?

 

[Glen]

This is going to sound stupid, but who cares, whats four thirds mean exactly with regard to lenses? :shrug:

 

[Joe T]

It's a standard put together by a group of comapnies including Sigma, Olympus, Panasonic (maybe) and one or two others that I cant remember. It means that any camera that has a 4/3rds mount can take any 4/3rds lens. I guess its a way for the other manufacturers to try to get a pool of lenses big enough to compete with Nikon and Canon.

The deignation refers to the size of the sensor, but I cant offhand remember exactly how. I do know there is a 2x focal length conversion factor compared to 35mm film.

HTH

 

[brummie]

This is going to sound stupid, but who cares, whats four thirds mean exactly with regard to lenses? :shrug:

I do

http://www.four-thirds.org

better than ya nikon and canon stuff

 

[SDK^]

300-800 on 4/3rds? Woah! Thats a 2x focal length factor isnt it?

The quoted focal length includes the 2x 'crop factor'

 

[brummie]

The quoted focal length includes the 2x 'crop factor'

Not according to reviews i have read

Sigma APO 300-800mm F5.6 EX DG HSM lens
The HSM provides ultra quiet, high-speed autofocusing as well as full-time manual focus override. This lens is designed to accept a 46mm circular polarizing filter in a rear filter holder. The introduction of this new lens increases Sigma's lens line-up for Four Thirds mount to a total of eleven models. With Four Thirds cameras the focal length will be equivalent to 600-1600mm.