Many digital camera sensors have anti-aliasing or low-pass filters (the same thing) to reduce response above Nyquist.
Anti-aliasing filters blur the image slightly; they reduce resolution. Kodak publishes MTF curves for a low cost anti-aliasing filter. Sharp cutoff filters don't exist in optics as they do in electronics, so some residual aliasing remains. Lens MTF losses also reduce aliasing. Analog reconstruction is not shown.
Aliasing from hell.
The 14 megapixel Kodak DCS 14n, and its successors, the Pro N and Pro C, have no antialiasing filter.