The 5DS R doesn't have the anti-aliasing filter removed – instead it has a 'cancelling filter' to cancel out its effect.A low pass filter is used over a sensor to reduce the risk of moire patterning by slightly softening the image. Hence removing or cancelling the effect of the filter makes it possible to resolve more detail, but brings increased risk of interference patterns when shooting fine repeating patterns. With very high resolution sensors this interference is less common and only likely with extremely fine patterns.As mentioned earlier, the 5DS has two Digic 6 processing engines instead of the single Digic 5+ processor of the 5D Mark III. This enables a native sensitivity range of ISO 100-6,400 with expansion settings taking this to ISO 50-12,800. For comparison, the native range of the 5D Mark III is ISO 100-12,800 and the expansion settings take the range to ISO 50-102,400.Despite all the processing power the 5DS is restricted to a maximum continuous shooting speed of 5fps (for up 510 Large Fine JPEGs or 14 raw files with a UDMA CompactFlash card installed) rather than the 6fps and 16,270 Large Fine JPEGs or 18 raw files of the 5D Mark III with the same card.Other significant changes from the 5D Mark III include a 150,000-pixel RGB+IR metering sensor with 252 zones and Intelligent Scene Analysis in place of the iFCL device with 63 zones in the 5D Mark III, a new M-Raw images size that records 28Mp images (as well as the 12.4Mp S-Raw option) and a USB 3.0 port instead of a USB 2.0 port for speedier image transfer. There's also an Intelligent Viewfinder II with AF point illumination in AI Servo mode instead of the original Intelligent Viewfinder in the 5D Mark III.
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