“When the moon hits your eye like a big pizza pie, that’s. . .” not a moire. DSLRs are made to capture large high quality photographic images, like 5760 px by 3840 px sized images. On the other hand, a video frame is only 1920 px by 1080 px, which is just a fraction of the pixels that DSLRs can capture. So when the camera needs to resize/resample down to video frame size, it needs to skip lines of pixels and what you end up with are jagged lines or strange color banding on subjects with very fine detail. These effects are called aliasing and moire.
- Avoid patterns such as brick buildings.
- Turn down the sharpness settings.
- Use anti-aliasing filters.
- Use higher resolutions (1920 px vs 720 px) to reduce resampling.
To help reduce moire and aliasing: