X-Trans CMOS Sensor, installed for the first time in premium interchangeable lens camera FUJIFILM X-Pro1, had the optical low pass filter, previously placed in front of the sensor, removed. To maximize the resolution capable by the lens, the function of reducing moire and false colors previously handled by the low pass filter were realized by pixel distribution and signal processing. By using a structure without a low pass filter, high image quality surpassing those of single lens reflex cameras with 35mm full frame sensors was realized. This achievement was highly praised by many of our customers. But at the same time, further efforts were being made toward realizing even higher image quality. The issue tackled was diffraction which inevitably occurs for all optical lenses during magnification. When more delicate subjects (high frequency subjects) are taken at a lower aperture, they appear out of focus when they should not. This is due to light expanding like waves while the photo is being taken. Even if the photographer zooms in and increases the depth of field to achieve an evenly sharp resolution, diffraction makes the finished product turn out entirely out of focus instead. The smaller the size of the sensor and the higher its pixel count (or the narrower its pixel pitch), the more likely that diffraction will occur….
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