Absence of an Optical Low Pass Filter (OLPF) or Anti-Aliasing filter(AA). An OLPF is used to eliminate moire by slightly blurring the image. The level of blurring is so small that it is not noticeable unless you zoom right in to pixel level. For some applications such as landscape photography, photographers may choose cameras without this feature to obtain the ultimate in image quality at the expense of moire which can be removed during the post-processing stage.
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