http://www.dpreview.com/news/0808/08080501microfourthirds.asp W- i&sUgy W- i&sUgy W- i&sUgy Olympus / Panasonic announce Micro Four Thirds
W- i&sUgy Tuesday, 5 August 2008 05:00 GMT< Previous Next > Olympus and Panasonic have announced a new, mirrorless format / lens mount based on (and compatible with) Four Thirds. The Micro Four Thirds system uses the same sensor size (18 x 13.5 mm) but allows slimmer cameras by removing the mirror box and optical viewfinder. The new format has three key technical differences: (1) roughly half the flange back distance (distance from mount to the sensor), (2) a smaller diameter lens mount (6 mm smaller) and (3) two additional contact points for lens-to-body communication (now 11 points). Removing the mirror mechanism allows this shorter flange back distance, meaning lenses for the new mount can be considerably smaller than current Four Thirds designs. The format will require framing to be carried out using Live View on either the LCD monitor or an EVF. Existing Four Thirds lenses can be used on Micro Four Thirds cameras using an adapter. Neither company is as yet making product announcements (we expect some more news in this respect closer to Photokina).
W- i&sUgy W- i&sUgy Phil: This is without doubt the most exciting digital photography announcement this year. It's fair to say that this "extension / addition" to the Four Thirds standard is finally able to deliver on the original promise of that format; considerably smaller and lighter lenses and bodies. Olympus are however keen to stress that this in no way replaces Four Thirds which will continue with new Four Thirds bodies and lenses in the future.
W- i&sUgy W- i&sUgy Jump to:
W- i&sUgy W- i&sUgy Our analysis
W- i&sUgy Press Release
W- i&sUgy Additional illustrations
W- i&sUgy Micro Four Thirds facts and features
W- i&sUgy Same Four Thirds sensor size (18 x 13.5 mm)
W- i&sUgy Flange back distance half that of Four Thirds (20 versus 40 mm)
W- i&sUgy Lens mount diameter 6 mm smaller (44 versus 50 mm)
W- i&sUgy Contrast Detect AF is implied (passive would require an external sensor)
W- i&sUgy Lens to body electrical contact points up to 11 from 9
W- i&sUgy Lenses of same focal length and maximum aperture considerably smaller than Four Thirds
W- i&sUgy Enables slim and compact lens-interchangeable digital cameras
W- i&sUgy Lack of mirror well necessitate a high quality EVF (or an EVF/Viewfinder-less design)
W- i&sUgy Current Four Thirds lenses can be used with an adapter
W- i&sUgy Enables seamless switching between still and movie shooting
W- i&sUgy W- i&sUgy W- i&sUgy W- i&sUgy 奥林巴斯/松下联合发布微型化4/3系统(Micro Four Thirds,简称MFT)
W- i&sUgy W- i&sUgy W- i&sUgy 奥林巴斯和松下近日公布了基于4/3画幅的无反光板和棱镜的系统MFT.微型4/3系统使用原有大小的画幅感光原件(18x13.5mm),不过取消了单反传统的反光板和光学取景器设计.这个新系统有三个关键的技术改变:
W- i&sUgy (1)法兰距只有原来的一半(即镜头卡口到感光元件的距离);
W- i&sUgy (2)镜头直径比原来缩小了6mm;
W- i&sUgy (3)增加了两个镜头触点(目前为9个).
W- i&sUgy W- i&sUgy W- i&sUgy 移除了5棱镜光学取景方式,意味着新的镜头设计可以比当前的4/3镜头体积更小.并通过LCD或者EVF进行实时取景.当前4/3的镜头可以通过转接环在这个新的MFT系统上使用.不过目前还没有实际的产品信息.
W- i&sUgy W- i&sUgy W- i&sUgy W- i&sUgy W- i&sUgy W- i&sUgy 这毫无疑问是今年数码领域最让人兴奋的新闻.4/3系统终于实现了成立当初其做过的承诺:更小更轻的镜头和机身.奥林巴斯也终于有目标可以坚持在4/3领域开拓新机型和镜头.
W- i&sUgy W- i&sUgy W- i&sUgy W- i&sUgy W- i&sUgy W- i&sUgy W- i&sUgy MFT主要规格和特性
W- i&sUgy *依旧采用4/3尺寸的感光原件
W- i&sUgy *法兰距减半(40mm缩小到20mm)
W- i&sUgy *镜头卡口直径由50mm减少为44mm
W- i&sUgy *支持对比反差检测AF方式
W- i&sUgy *镜头卡口接口触点由9个改为11个
W- i&sUgy *同样焦距和光圈的镜头可以做得比现在更小
W- i&sUgy *允许做为不可更换镜头的数码相机设计(4/3版本的DP1?)
W- i&sUgy *没有反光板以后可加入EVF取景设计(或者不需要,反正小DC都没VF的啦)
W- i&sUgy *目前的4/3镜头可通过转接环在新系统上使用(不知道该说O是给镜头保值还是多赚了笔转接环的钱...)
[ 此贴被青菜哥哥在2008-08-22 11:30重新编辑 ]
