Sony: G Master Design Philosophy
Sony's α Universe hosts a numbered run of developer interviews in which the engineering team explains the design thinking behind each G Master lens. Every installment takes one lens and works through its optical concept, the aspherical and extra-low-dispersion elements it required, the bokeh and resolution targets Sony set for it, and the focus actuators chosen to move its groups.
The series is Japanese-language only; Sony publishes no English edition of it. The interviews are the closest Sony analogue to Canon's RF Lens World developer panels and Panasonic's Optical Design Department essays.
Installment Index
Installments are numbered 001 through 012 and are listed here newest first. Sony shows no publication date on the individual pages, so none is inferred.
| Sequence | Lens | Official interview | Surface & Stop |
|---|---|---|---|
| 012 | FE 24–70mm F2.8 GM II | Read at Sony | FE 24–70mm F2.8 GM II |
| 011 | FE 12–24mm F2.8 GM | Read at Sony | FE 12–24mm F2.8 GM |
| 010 | FE 600mm F4 GM OSS | Read at Sony | FE 600mm F4 GM OSS |
| 009 | FE 135mm F1.8 GM | Read at Sony | FE 135mm F1.8 GM |
| 008 | FE 24mm F1.4 GM | Read at Sony | FE 24mm F1.4 GM |
| 007 | FE 400mm F2.8 GM OSS | Read at Sony | FE 400mm F2.8 GM OSS |
| 006 | FE 16–35mm F2.8 GM | Read at Sony | FE 16–35mm F2.8 GM |
| 005 | FE 100mm F2.8 STF GM OSS | Read at Sony | — |
| 004 | FE 100–400mm F4.5–5.6 GM OSS | Read at Sony | — |
| 003 | FE 70–200mm F2.8 GM OSS | Read at Sony | FE 70–200mm F2.8 GM OSS |
| 002 | FE 85mm F1.4 GM | Read at Sony | FE 85mm F1.4 GM |
| 001 | FE 24–70mm F2.8 GM | Read at Sony | — |
Installments 001 and 006 cover the first-generation FE 24–70mm F2.8 GM and FE 16–35mm F2.8 GM. Installment 006 links to the original FE 16–35mm F2.8 GM now held in the catalog. For the 24–70mm the catalog holds only the Mark II, a separate optical design, so row 001 is deliberately left unlinked. Installment 002 links to the original FE 85mm F1.4 GM.
Sony's own interview sub-index is out of date: it lists ten installments and still marks the FE 12–24mm F2.8 GM as forthcoming. The G Master landing page is the reliable entry point.
Additional Sony Lens Design Material
Sony has also published G Master developer interviews outside the numbered series. The three Japanese features below are linked from the G Master landing page; the FE 50mm F1.2 GM interview also has an English edition on Alpha Universe. They are listed newest lens first.
| Lens | Published | Official article | Surface & Stop |
|---|---|---|---|
| FE 28–70mm F2 GM | 2025-07-02 | FE 28-70mm F2 GM 開発者インタビュー | FE 28–70mm F2 GM |
| FE 85mm F1.4 GM II | Not shown | Developer roundtable (Japanese) | FE 85mm F1.4 GM II |
| FE 50mm F1.2 GM | 2021-03-17 | 「G Master」の設計思想や魅力を開発陣が解説 FE 50mm F1.2 GM編 | FE 50mm F1.2 GM |
| FE 50mm F1.2 GM | 2021-04-20 | What Goes Into Building The Best 50mm Lens (English) | FE 50mm F1.2 GM |
Sony's regional sites also carry pages titled "Engineer Interviews | G Master Lenses," but they did not serve content to automated checks and are not linked here until their contents can be confirmed.