>这是从ZEISS网站弄下来的，没别的意思，,,,

有意思那又咋地? 说话还要那么"小心"?

这是从ZEISS网站弄下来的，没别的意思，只是了解了解镜头的结构和来历而已。

Biogon

A lens with an angle of view so wide that it can capture very much of the life around us in a single frame – this is what the name originally means.

A focal lenght only half the diagonal of the film frame, produced with an almost symmetric lens design of surprising compactness, featuring the typical advantages of symmetrical lens designs: distortion is extremely well controlled, and so is color correction and image field flatness.

Combined with extreme precise manufacturing these properties make for an outstanding wide angle optic with high resolution, an excellent documentation tool.

This is exactly what is needed in aerial mapping photography, a field where Carl Zeiss has played a leading – even revolutionizing – role worldwide for almost a century, hence the expertise to design and manufacture such an outstanding high-performance lens like the Biogon® T* 4,5/38 lens, invented by Dr. Ludwig Bertele at Carl Zeiss in 1953.

Biogon® T* 2,8/21 lens for the Contax G-system.Biogon® T* 4,5/38 lens for the Hasselblad SWC Superwide camera.Since the last vertex is located only 18.8 mm away from the film plane, no viewfinder-mirror can be placed between Biogon® lens and film. So Biogon® lenses cannot be used with SLR type cameras. On the other hand is the performance of the Biogon so outstanding, that this lens is worth a precision camera body of its own:

The famous Hasselblad Superwide Camera SWC, the state-of-the-art wide angle device in medium format for almost 50 years and the premium choice for those who demand the utmost in wide angle performance on earth and in space.

Lazybaby：Planar就是对称结构，从高斯结构演变而来。

[xitek 编辑于 2001-10-14 12:57 ]

Goetz Dagor, 是一只很有名的人象镜，无镀膜拍出的黑白片及据特色，现在仍有很多人用他，二手的也很贵。[sdnk 编辑于 2001-08-12 10:10]

triplet3

triplet

protar3

protar

planar1