For still photography on film, the usual sensor-style spatial aliasing does not occur inside the camera. Aliasing comes from regular sampling at too low a frequency, and film grain is not arranged on a regular grid, so it does not create the same pixel-grid interactions that cause digital moiré and false detail.

If film grains were regularly spaced, aliasing could occur similarly to a digital sensor, but normal photographic film is not like that.

However, aliasing-like effects can still appear in other ways:

• In motion pictures, temporal aliasing can occur because frames are captured at regular time intervals. This is why wagon wheels or propellers can appear to rotate slowly or backwards.
• Scene patterns themselves can produce moiré or interference effects that are visible regardless of whether the image is captured on film or digitally.

So: for still film capture, no regular-grain sampling means no typical in-camera spatial aliasing; but temporal aliasing and visible pattern interference can still occur.