Previously, I was already using three cameras — the Zeiss Ikon CONTAX RF, Kyocera CONTAX SLR, and Sony A7III — and I also owned three 35mm f/2.8 wide-angle lenses, namely the Biogon, Distagon, and Sonnar, each representing different optical designs. On a whim, I started wondering whether there were any other 35mm f/2.8 lenses within the Zeiss lineup that featured different optical designs. The answer turned out to be Flektogon and Biometar. The former comes in M42 and Exakta mount versions, while the latter is available in the CONTAX RF mount. The Flektogon 35mm f/2.8 M42 is relatively easy to find on the second-hand market, so I also picked up a Pentacon Praktica L camera to pair with it, adding another set to my Zeiss 35mm f/2.8 lens collection. As for the Carl Zeiss Jena Biometar 35mm f/2.8, not only is it quite expensive, but it also overlaps in focal length with my existing Zeiss-Opton 35mm f/2.8, so I decided to put that idea on hold for now. Below is a description of these lenses quoted from ChatGPT:
先前因為已經使用 Zeiss Ikon CONTAX RF、Kyocera CONTAX SLR、SONY A7III 這三台相機，也同時擁有了三顆 35mm f2.8 的廣角鏡頭，依序是 Biogon、Distagon、Sonnar 這三種光學設計。 一時心血來潮，想說看看 Zeiss 鏡頭群中是不是還有其他不同光學設計的 35mm f2.8 鏡頭，答案是 Flektogon 和 Biometar，前者有 M42 和 Exakta 兩種相機接環版本，後者則是 CONTAX RF 相機接環版本。 Flektogon 35mm f2.8 M42 在二手市場上相對比較好取得，我也同時找了一台Pentacon Praktica L 相機來搭配，讓我的 Zeiss 35mm f2.8 鏡頭收集又多了一組。至於 Carl Zeiss Jena biometar 35mm f2.8 這顆鏡頭，除了價格不便宜，同時也和手上的 Zeiss-Opton 35mm f2.8 焦段重複，就暫時先打消收集的念頭了。以下引用 ChatGPT 對這些鏡頭的介紹：
These four 35mm f/2.8 lenses represent the optical pinnacle of Zeiss across different eras and camera systems. Although they share the same maximum aperture, their internal constructions and rendering characteristics are completely distinct:
這四款 35mm f/2.8 鏡頭代表了蔡司（Zeiss）在不同時代與相機系統上的光學巔峰。雖然光圈相同，但其內部構造與成像個性截然不同：
Zeiss 35mm f2.8 Lens Collection
(1) Biogon 35mm f/2.8: The Distortion Killer of the Rangefinder World
Optical Design: Highly symmetrical construction.
Key Strength: Near-zero distortion. Because the rear element sits extremely close to the film plane, the light path is very direct, resulting in minimal distortion and exceptionally high resolution.
Best Suited For: Street photographers and architectural photography enthusiasts.
Representative Model: Post-war Zeiss Ikon Contax RF.
(1) Biogon 35mm f/2.8：旁軸界的畸變剋星
光學結構： 高度對稱設計（Symmetrical Design）。
核心優勢： 零畸變。因為後鏡組極度靠近感光元件，光線路徑直，幾乎沒有變形，且解析度極高。
適合誰： 街頭攝影師、建築攝影愛好者。
代表作： Zeiss Ikon Contax RF 戰後版。
(2) Distagon 35mm f/2.8: A Stable Foundation for SLR Cameras
Optical Design: Retrofocus construction.
Key Strength: Excellent edge-to-edge image quality. The design deliberately extends the back focus distance to clear the SLR mirror, which also results in favorable light incidence angles on digital sensors.
Best Suited For: Photographers who appreciate classic Zeiss rendering with strong tonal depth and balanced performance across the frame.
Representative Model: Contax Zeiss 35mm f/2.8 T* (C/Y mount).
(2) Distagon 35mm f/2.8：單眼相機的穩定基石
光學結構： 反望遠結構（Retrofocus）。
核心優勢： 邊角畫質優異。為了避開單眼相機的反光鏡，設計上刻意拉長後焦距，這讓它在數位機身上也有很好的光線入射角。
適合誰： 喜歡德系層次感、追求全畫面平衡的攝影師。
代表作： Contax Zeiss 35/2.8 T* (C/Y 卡口)。
(3) Flektogon 35mm f/2.8: The Close-Focus Legend of East German Zeiss
Optical Design: Early retrofocus design (from Carl Zeiss Jena, East Germany).
Key Strength: Exceptional close-focus capability. The minimum focusing distance is typically around 18–19 cm, allowing for wide-angle shots with a macro-like perspective.
Best Suited For: Photographers who enjoy vintage lens character, especially for still life and flower photography.
Representative Model: Carl Zeiss Jena 35mm f/2.8 (M42 mount, commonly known as the “zebra version”).
(3) Flektogon 35mm f/2.8：東蔡的近攝傳奇
光學結構： 早期反望遠設計（來自東德 Carl Zeiss Jena）。
核心優勢： 超強近攝能力。最短對焦距離通常僅 18-19cm，能拍出具備廣角透視感的微距效果。
適合誰： 喜歡老鏡氛圍、拍攝靜物或花卉的玩家。
代表作： Carl Zeiss Jena 35/2.8 (M42卡口，俗稱「斑馬版」)。
(4) Sonnar 35mm f/2.8: A Modern Benchmark for Compactness
Optical Design: An asymmetric evolution of the Gauss-type design.
Key Strength: Exceptional compactness and high contrast. Despite its relatively simple construction, it is highly efficient, producing rich colors and the clear, modern Zeiss rendering.
Best Suited For: Photographers who prioritize portability and a “carry-everywhere” setup, especially Sony E-mount users.
Representative Model: Sony Zeiss FE 35mm f/2.8 ZA (pancake lens).
(4) Sonnar 35mm f/2.8：現代輕量化代名詞
光學結構： 非對稱的高斯演進版。
核心優勢： 極致輕便與高對比。結構簡單但效率極高，成像色彩濃郁且帶有現代蔡司的通透感。
適合誰： 追求「隨身機」手感、Sony E 接環用戶。
代表作： Sony Zeiss FE 35mm f/2.8 ZA (餅乾鏡)。
If you prioritize maximum resolution and near-zero distortion, choose the Biogon
→ e.g. ZEISS Biogon T* 35mm f/2.8 ZM
If you want close-up or macro-like wide-angle shots, choose the Flektogon
→ e.g. Carl Zeiss Jena Flektogon 35mm f/2.8 M42
If you want the most compact autofocus lens, choose the Sonnar (FE version)
→ e.g. Sony Zeiss FE 35mm f/2.8 ZA
If you’re on a budget but want classic Zeiss T* color rendering, choose the Distagon
→ e.g. Carl Zeiss Distagon 35mm f/2.8 (C/Y mount)
快速選購指南
如果你追求最高解像力與無變形 選 Biogon。
如果你想拍微距或特寫 選 Flektogon。
如果你想要最輕便的自動對焦鏡 選 Sonnar (FE版)。
如果你預算有限但想要經典 T* 色彩 選 Distagon。
The minimum focusing distances of these four lenses differ quite significantly. I’ve included uncropped sample photos taken with them adapted to the Sony A7 III for your reference.
這四顆鏡頭的最近對焦距離差異還蠻大的，附上專接到 Sony A7 III 拍攝的未裁切相片給讀者們參考。
Carl Zeiss Jena Flektogon 35mm f2.8
Carl Zeiss Distagon 35mm f2.8 T*
Carl Zeiss Sonnar FE 35mm f2.8 ZA T*
Zeiss-Opton Biogon 35mm f2.8 T
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