CONTAX CLUB Carl Zeiss 討論區

8 elements in 7 groups design, 有機會係 85 f/1.4 蔡鏡之中最好嘅一枝, 又揾藉口比自己投資 Dynax 9 呢 D 頂級 body...

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70% Film
30% Digital

二手都係五千有找
連直倒

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我很窮,但我愛contax!

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Best Regards,

Terry Shum
香港互聯網康泰時攝影會幹事

極高光學性能, 嚴格品質管理, 極少生產數量:

http://www.sony.jp/products/di-world/al ... 61031.html

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Best Regards,

Terry Shum
香港互聯網康泰時攝影會幹事

D sample好似唔係好合我心意

鏡組與 MTF 圖 recap ~

http://www.ecat.sony.co.jp/alpha/lens/lens.cfm?PD=24689

人算不如天算，唔知此鏡配a-100機身的對焦精確度和速度怎麼樣？

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會計
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鯨魚愛Zeiss

Some samples from Sony Studio:

http://www.dchome.net/viewthread.php?ti ... 3D1&page=2

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Best Regards,

Terry Shum
香港互聯網康泰時攝影會幹事

睇完呢輯相令我立即中毒
一直都諗緊 ZM, ZF 定 ZA
ZM 支85 未出, 出左都應該好貴 (MIG)
ZF 我覺得好sharp, 但好硬, 似日本仔鏡, 完全唔似 C/Y表現
ZA sharp 得來唔硬......完全係我想要的那種德鏡表現

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不過, 只係睇相, 而且每張都唔同地方,時間,光源拍, 所以我的意見並不客觀
最好有大大做新一代85mm蔡頭測試咁就 very good la!

係囉, 原來此的設計與zf85/1.4都有d唔同, 唔知邊個設計會較近似傳統planar的設計呢? 雖然兩支都話係planar, 但係兩支前端的鏡組好似唔同喎

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攝影．助我留下回憶
回憶．使我珍惜現在
現在．讓我面對將來


Billy Ting
http://billyting.fotop.net/

the ZF should be closer to the original symmertrical design the front element is different i guess is becoz it is a moving element for focusing which will extend on focus operation

據其他大大所說，歴代咁多 P85/1.4 都根本唔似 Planar design，內裡並無任何 symmetrical 可言，P85 係一變種的 design 應歸類為 Biotar/Biometer (?)。這個詳情要找 FR 發表好了.........

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會計
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鯨魚愛Zeiss

唔通planar的精髓真係放晒係支cfi100/3.5度???

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Billy Ting
http://billyting.fotop.net/

In fact that kind of saying is true. Before WW-II, there is 4 or 5 type of Double Gaussian Design from Zeiss. Now the oldest and no longer used Anastigmat Protar is a classic application of Gaussian Symmetrical that was used in Brass Barrel lens of 1880 to 1900 vintage, the development of such might be best visioned in the Topogon ( Yes the Topogon is a Double Gaussian , Double Gaussian is not the same as Planar ).

What Planar are is a modification of Classic Doubel Gaussian by the fellowing

- Buried surface using a Achromitized doublet to replace the inner Convex element

- Narrow the air gap between the front and rear as much as possible to correct for highh order abbration

- Significantly thicken the inner crown of the doublet to control and correct image correction

- use of Symmetry to correct for primary abbrations


And by that account, none of the post war Planar is Planar at all bar the development in the S-Planar, and many of the Makro Planar.

Because Zeiss pre war had already recognized that Planar is not that great an idea for use in smaller format, there evolve 2 further variation, namely Asymmetrical application of the Planar ( both element size and Element correction which is termed Biotar ( which is about what almost all the major post war Planar are ), and the usage of a 5 element basic structure ( replacing one doublet with a significally curved single element miniscus and this variation is the Biometar.

Todays modern Planar are all development of the Biotar and Biometar optical design. The only real planar is those used in Makro ( loosely speaking ). History as it is, was that when war ended, and when Carl Zeiss West German start to use Double Gauss for lens design the name Biotar and Biometar was very successfully employed by the East German Carl Zeiss Jena. The fact is simply that then they do not want to use the same name so implying that they were similar or the same. They just use Planar for all the Double Gaussian aka Planar ...

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