Fujinon GF 50mm F3.5 LM WR
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Fujinon GF 50mm F3.5 LM WR

This shot shows the rear element of the GF 50mm F3.5. Compare this with the markedly small front element, and you might spot a theme with modern prime lenses designed for mirrorless systems. The short flange back and wide diameters of dedicated mirrorless camera mounts compared to legacy SLR systems allow optical designers to include large rear elements, positioned close to the imaging surface. Large rear elements allow for the potential to keep light rays at the peripheries of the image somewhat perpendicular to the sensor - in other words, less oblique. As such, higher resolution, lower chromatic aberration, and less vignetting can be achieved nearer to the edges of the frame. This can also mitigate the need for complex software corrections.

Furthermore, by making the rear elements of lenses like this slightly convex relative to the imaging surface, light that reflects back from the sensor can mostly be bounced outwards, beyond the imaging area. This reduces the risk of 'ghosting' when bright highlights appear in a scene.

The GF 50mm F3.5 will be available later this year, pricing still TBD.