The publication of Fujifilm Patent P2026091132 on June 3, 2026 (initially filed on November 22, 2024), outlines the highly complex optical architectures required to project a zoomable, constant-aperture image circle across a medium format sensor. The mathematical embodiments detailed within the filing directly correlate with the commercial announcement of the Fujinon GF32-90mm T3.5 PZ OIS WR. This lens, launched alongside the $16,499.95 Fujifilm GFX Eterna 55 cinema camera, signifies a modernization of medium format cinematography characterized by the integration of power zoom (PZ) servos, optical image stabilization (OIS), and advanced autofocus mechanisms.
Patent P2026091132, titled “Zoom Lens and Imaging Device,” explicitly outlines the objective of engineering a zoom lens that balances compact physical dimensions with the optical performance required for a sensor diagonal exceeding 54mm while maintaining a constant geometric aperture. Two specific embodiments represent the viable commercial pathways.
Embodiment 1 is the theoretical precursor to the commercially realized GF32-90mm T3.5 PZ OIS WR. It specifies a focal length range spanning from 32.94mm to 87.33mm, providing an equivalent field of view of approximately 25-71mm on a 35mm full-frame standard. The mathematical parameters define a Half Angle of View ranging from 82.2 degrees to 32.0 degrees, confirming the design intent to illuminate the 55mm image circle required by the GFX Eterna’s open-gate recording modes.
The geometric aperture (F-number) in Embodiment 1 fluctuates nominally between f/3.19 and f/3.30. Maintaining this near-constant ratio requires the internal zoom groups to enact precise mechanical compensations, shifting the aperture diaphragm relative to the optical nodes as focal length increases.
Embodiment 4 describes a telephoto zoom configuration with a focal length range of 36.14mm to 97.51mm. The Half Angle of View ranges from 75.6 degrees to 28.4 degrees. Crucially, the patent specifies an absolute constant F-number of f/3.21 across the entire range.
While Embodiment 1 was selected for commercial production, achieving a mathematically perfect constant f/3.21 aperture at a 100mm focal length on a medium format sensor necessitates a front element significantly larger than the 32-90mm variant. The GF32-90mm lens utilizes an industry-standard 114mm front outer diameter and a 111mm internal filter thread, weighing 2.1kg (4.6 lbs). Pushing the telephoto reach to 100mm at a constant aperture would likely force the front diameter beyond the 114mm cinema standard and exceed optimal weight thresholds.
| Parameter | Embodiment 1 (Patent Specification) | Embodiment 4 (Patent Specification) | Commercial Execution (GF32-90mm) |
|---|---|---|---|
| Focal Length Range | 32.94mm – 87.33mm | 36.14mm – 97.51mm | 32mm – 90mm (25-71mm equivalent) |
| Maximum Aperture | f/3.19 – f/3.30 | f/3.21 (Constant) | Constant T3.5 (Derived from f/3.2) |
| Half Angle of View | 82.2° – 32.0° | 75.6° – 28.4° | 81.0° – 33.8° |
| Calculated Zoom Ratio | ~2.65x | ~2.70x | ~2.81x |
Patent P2026091132 details an optical system operating at a geometric f/3.2, while the commercial lens is branded as a constant T3.5. The F-number assumes a perfectly transparent optical system. However, the GF32-90mm features a dense internal structure comprising 25 individual lens elements arranged into 19 groups. Light interacting with these interfaces experiences transmission loss, despite the application of Fujifilm’s Super EBC multi-layer anti-reflective coatings.
In cinematography, absolute exposure consistency is required to prevent temporal inconsistencies during editing. The T-stop (Transmission-stop) measures the actual amount of light that successfully exits the rear element. By calibrating the lens as a constant T3.5, Fujifilm guarantees that the volume of light striking the sensor remains identical whether set to 32mm or 90mm.
The GF32-90mm must service the GFX Eterna 55’s 102-megapixel BSI CMOS sensor (43.8mm x 32.9mm). Resolving detail across a 54.77mm diagonal requires specific optical corrections within the 25-element formula.
The mechanical construction of the GF32-90mm deviates significantly from photographic equivalents to meet professional production standards.
The GF32-90mm integrates electro-mechanical features rarely found in dedicated cinema zoom lenses.
The GFX Eterna 55’s sensor is over 40% larger than the standard 36mm x 24mm full-frame format. The GF32-90mm physically projects a 32-90mm focal length, dictating depth of field and compression, while the large sensor yields a wider 25-71mm equivalent field of view. The lens is optically corrected to illuminate the entire 55mm image circle for the Eterna’s open-gate 4:3 8K recording mode, allowing post-production extraction of various aspect ratios from a single file. It is designed to resolve the colorimetry required for Fujifilm’s Film Simulations, F-Log2 C color space, and 3D LUTs.
The design philosophy of the cinematic GF32-90mm contrasts sharply with photographic medium format zooms, such as the Hasselblad XCD 35-100mm f/2.8-4 E, which covers an identical 44 x 33mm sensor.
The Hasselblad prioritizes portability (894 grams) by utilizing a variable aperture (f/2.8 to f/4) and a simplified 16-element formula. In cinematography, a variable aperture causes exposure shifts during zooming. To secure parfocal behavior and constant exposure, the GF32-90mm utilizes a massive 25-element architecture, driving the filter thread up to 111mm and the total weight to 2.1kg (4.63 lbs).
| Specification | Fujinon GF32-90mm T3.5 PZ OIS WR (Cinematic) | Hasselblad XCD 35-100mm f/2.8-4 E (Photographic) |
|---|---|---|
| Primary Application | Motion Picture / Cinematography | Still Photography |
| Aperture Architecture | Constant T3.5 (Derived from f/3.2 patent) | Variable f/2.8 to f/4.0 |
| Internal Optical Design | 25 Elements in 19 Groups | 16 Elements in 13 Groups |
| Aperture Diaphragm | 13 Blades (Rounded) | Standard Photographic (Typically 7 or 9) |
| Front Filter Thread | 111mm | 86mm |
| Physical Weight | 2.1 kg (4.63 lbs) | 894 g (2.0 lbs) |
| Zoom Actuation Mechanism | Power Zoom (Servo) & Manual Geared (0.8 MOD) | Manual Only (Ungeared) |
| Image Stabilization | Dedicated Optical Image Stabilization (OIS) | None (Relies entirely on camera IBIS) |
The GF32-90mm T3.5 PZ OIS WR inherits optical and mechanical technologies from Fujifilm’s Premista line of large-format cinema lenses, adapting broadcast-tier performance into a $5,999.95 form factor. Furthermore, the revelations within Patent P2026091132 provide a roadmap for the GFX Eterna ecosystem. The existence of Embodiment 4 (the 35-100mm f/3.2 design) indicates that Fujifilm has already mapped the mathematics for extended focal ranges, suggesting the potential for companion cine zooms—such as an 80-200mm telephoto or a 14-30mm ultra-wide—engineered with identical 0.8 MOD gearing and 114mm front diameters to complete the optical set.
FUJIFILM GFX ETERNA 55:
B&H Photo / Amazon / Adorama
FUJIFILM GF 32-90mm T3.5 PZ OIS WR:
B&H Photo / Amazon / Adorama
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