Sony FE 400mm f/4.5 GM + 600mm f/6.3 GM (Rumor): Sep 15 announce lock
(Rumor / unconfirmed.) Sony has not announced these two GM tele primes. SonyAlphaRumors now pins them to September 15 around 3–4pm London. The FE 8-14mm F3.5 Fisheye G is already official — this page is the teles only.
September 12, 2026 · Score 80 · Rumor · Material follow-up
Sony FE 400mm F4.5 GM OSS (SEL400F45GM), official product image released with Sony’s September 15, 2026 announcement. Added October 7, 2026; the text on this page is the earlier rumor. Image: Sony / Alpha Universe.Sony FE 600mm F6.3 GM OSS (SEL600F63GM), official product image released with Sony’s September 15, 2026 announcement. Image: Sony / Alpha Universe.
Rumor page, published September 12, 2026, before Sony announced these lenses. The product images are Sony’s official images from the September 15 announcement; see our official coverage.
HIGHLIGHTS
The lightweight Sony wildlife pair that was supposed to land with the fisheye is now pinned to a clock. Multiple SonyAlphaRumors sources put the FE 400mm f/4.5 GM OSS and FE 600mm f/6.3 GM OSS on September 15, 2026 around 3–4pm London, with preorders expected to open the same hour. The fisheye already shipped as an official story on September 8; these two GM teles are the unfinished half of that rumor trio.
The size story has not softened. Both primes are still talked about as sub-kilogram bodies — about 994 g and 995 g, with barrels around 108 × 242 mm and 108 × 263 mm — framed by SAR as lighter than the matching Nikkor Z 400/4.5 and Z 600/6.3. Dollar bands still sit near $2,699–$2,899 and about $3,800, with EU chatter around €3,000 and €4,200. Treat every gram and dollar as rumor until Sony publishes a sheet.
That weight is the whole point for bird and sports shooters. On Fred Miranda, the thread keeps comparing a dedicated 600/6.3 to living on a 300 GM + converters, arguing reach with a 1.4× versus a 2×, and asking whether close focus will beat Nikon’s long-distance habit. Until Sony puts glass on a table, every number stays rumor — but the calendar just got hard.
Rumor desk — the two teles
Rumor framing only. Sony has not published these lenses. SAR’s “Confirmed” headline is a rumor-site trusted-source claim for the date, not Sony press. Sources do not say these replace the faster, heavier FE 400mm f/2.8 GM OSS or FE 600mm f/4 GM OSS.
FE 400mm f/4.5 GM OSS — leak size/weight ~108 × 242 mm · ~994 g (SAR compare: ~14% lighter than Z 400/4.5)
FE 600mm f/6.3 GM OSS — leak size/weight ~108 × 263 mm · ~995 g (SAR compare: ~28% lighter than Z 600/6.3)
Tester soft notes (SAR): look similar to the 300mm GM; no drop-in filter on the 400; 600 rumored at 2.5 m minimum focus. Optics formula, AF system detail, weather sealing, teleconverter support, and Phase Fresnel are not in the leaks — omitted here rather than invented.
Rumored specifications
Every dollar, euro, and gram below is labeled leak/rumor from SonyAlphaRumors and aggregators repeating SAR. Never treat these figures as MSRP.
Status
Rumor / unconfirmed — Sony has not announced
Models (rumored)
FE 400mm f/4.5 GM OSS · FE 600mm f/6.3 GM OSS
Announce timing (rumored)
Sep 15, 2026 ~3–4pm London — not Sony
Preorders (rumored)
Same hour Sep 15
400 size / weight (rumored)
108 × 242 mm · 994 g
600 size / weight (rumored)
108 × 263 mm · 995 g
400 US $ (rumored)
$2,699–$2,899 — not MSRP
600 US $ (rumored)
~$3,800 — not MSRP
400 EU € (rumored)
~€3,000 — not MSRP
600 EU € (rumored)
~€4,200 — not MSRP
400 filter (rumored)
No drop-in filter
600 close focus (rumored)
2.5 m minimum focus
Appearance (soft rumor)
Look similar to 300mm GM; no rear drop-in
Replacement of 400/2.8 or 600/4?
Unclear — sources do not say
Optics / AF / weather / TC / PF
Not in leaks — omitted
Price / availability (rumor only). US and EU figures above are from rumor aggregators; SAR has flagged US $ as possibly aggressive. No retailer SKUs, no official ship dates.
Sample photos
N/A. These lenses are not announced and not shipping. We are not inventing sample photos or pulling “GM lookalike” wildlife frames as if they are from these primes.
Verdict
Pros
If real, sub-1 kg 400/4.5 and 600/6.3 GM primes would fill a portable tier beside the faster GMs
The Sep 15 clock lock is the first hard calendar claim since the missed Sep 8 window
Cons
Sony is silent; SAR “Confirmed” = trusted-source date claim, not a press release
Rumor $ may be aggressive; no optics/AF/weather/TC detail in leaks
Related (already official). The FE 8-14mm F3.5 Fisheye G is not still unannounced — see SEL814G official. APERTURE NOTES’s Sony FE 100-400mm F5.6-8 OSS is an unrelated F5.6-8 zoom, not prior coverage of these GM teles.
SonyAlphaRumors now locks the FE 400mm f/4.5 GM OSS and FE 600mm f/6.3 GM OSS to September 15 around 3–4pm London, with preorders expected the same hour. Weights stay in the sub-kilogram band (~994 g / ~995 g; 108 × 242 mm / 108 × 263 mm). Dollar bands remain $2,699–$2,899 and about $3,800, with EU chatter around €3,000 / €4,200. All of that is still rumor. Sony has not announced. There is no sample gallery.
Our September 8 trio rumor bundled these two GMs with the 8-14 f/3.5 G against a Sep 8 ~3pm London window. That page is left unchanged as the historical record. The fisheye is already official — see SEL814G — so this page is the teles only.
The new fact is the Sep 15 clock lock plus a refreshed confirmation tone on the same weight and price bands, not a new optical sheet. 8-14 is removed from this story. Still rumor, still samples N/A, still no fake GM cutouts.
