The Sony FE 100mm F2.8 STF GM OSS is a specialized, flagship G Master prime lens, unique for its STF (Smooth Trans Focus) technology. This lens is the definitive rental choice for photographers in Japan seeking exceptionally beautiful, artistic bokeh (background blur) while maintaining high full-frame resolution. The 100mm focal length is perfect for portraits and selective focus.
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Contact Jasumo Now →The lens utilizes an APD (Apodization) optical element to ensure maximum smoothness in the transition from sharp focus to soft blur. Despite being labeled F2.8, its actual light transmission (T-stop) is T5.6. It features fast AF and built-in Optical SteadyShot (OSS) stabilization.
Experience a new level of aesthetic control with the Sony FE 100mm F2.8 STF GM OSS. This lens is not just about sharpness; it’s about the quality of the blur. The unique STF design, incorporating an APD filter, smooths out the edges of background elements, making the bokeh incredibly creamy and soft, giving your Japanese portraits and close-ups a distinct, dream-like quality.
The SEL100F28GM is optically built with 13 elements in 10 groups (excluding the APD element), ensuring high fidelity. The APD element is essentially a radial neutral density filter that gradually darkens toward the edges, leading to the smooth bokeh transition.
The lens features dual minimum focusing distances controlled by a Macro Switching Ring: a normal range (0.85m to infinity) and a close-up range (0.57m to 1.0m), providing a maximum magnification of 0.25x for compelling close-up shots. The built-in OSS stabilization, combined with the camera body’s stabilization, ensures maximum sharpness even when shooting handheld at this telephoto length.
| Feature | Specification |
| Focal Length | 100 mm |
| Max Aperture (F/T) | F2.8 (T5.6) |
| Min Focusing Distance | 0.57 m (Macro Mode) |
| Max Magnification | 0.25 times (Macro Mode) |
| Mass (Approx.) | 700 grams |
| Filter Diameter | 72 mm |
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The F-stop (F2.8) indicates the physical size of the aperture and determines the depth of field (how much is in focus). The T-stop (T5.6) indicates the actual amount of light transmitted through the lens to the sensor, which determines the exposure. Because of the APD filter, you get the shallow depth of field of F2.8 but must expose as if you were shooting at T5.6.
Due to the T5.6 light transmission, this lens is not ideal for extremely low-light action photography. It performs best in daylight or controlled studio lighting where the superb bokeh quality can be maximized. For low light, you would rely on the camera’s high ISO capability.
The ring physically changes the focus limiter of the lens. In the standard position (0.85m to infinity), the lens is fastest for general portraits. Switching to the Macro position (0.57m to 1.0m) dedicates the lens for closer work, providing a higher maximum magnification (0.25x) for detailed close-ups.
No, the autofocus performance on the SEL100F28GM is fast and reliable for both stills and video, making it the first STF lens to truly support modern autofocus capabilities without compromise.
The built-in OSS (Optical SteadyShot) is very useful on a 100mm telephoto prime. It significantly reduces camera shake, allowing you to shoot handheld at slower shutter speeds than usual, which helps compensate slightly for the T5.6 exposure rating and ensures maximum sharpness for portraits.
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