Sony has confirmed it will announce two new professional-grade telephoto lenses on September 15 at approximately 3pm London time. The upcoming FE 400mm f/4.5 GM OSS and FE 600mm f/4.5 GM OSS lenses are set to expand Sony’s G Master lineup, targeting wildlife, sports, and nature photographers who demand high performance in demanding conditions. Multiple trusted sources have verified the announcement timing, ending speculation that has surrounded these lenses for months.

The lenses are expected to build on Sony’s reputation for advanced autofocus and cutting-edge sensor technology integration, key strengths that have made its Alpha series a favorite among professional creators. While specific technical details remain unconfirmed in the current leak, Sony’s GM series is historically known for combining exceptional optical quality with fast, accurate autofocus systems — critical for tracking fast-moving subjects. The inclusion of OSS (Optical SteadyShot) further enhances handheld usability in the field.

Early indications suggest the 400mm model will be notably lightweight, with comparisons pointing to a 14% weight reduction over the Nikon Z 400mm f/4.5 VR lens, potentially improving portability without sacrificing reach or stability. This focus on ergonomics aligns with the needs of creators who spend long hours in remote or dynamic shooting environments. The 600mm variant is anticipated to offer similar advancements in reach and performance.

For professional and semi-professional creators investing in high-end glass, the announcement represents a significant step in Sony’s continued commitment to the full-frame mirrorless ecosystem. By extending its telephoto offerings with GM-level precision, Sony aims to strengthen its position in competitive segments where autofocus reliability and sensor synergy are paramount. More details are expected to emerge directly from Sony’s official presentation on September 15.