What is a low-pass filter?

- When you're shopping for a camera…and looking at spec sheets,…you might come across the term low-pass filter…or anti-aliasing filter.…These are two terms for the same thing.…It's a filter that sits in front of the image sensor…inside the camera.…It's not a part of the camera…that you'll ever interact with.…It's nothing you have any control over.…It's also not something that all cameras have…and that's why it's a term you may come across…when camera shopping.…The lack of low-pass filter can be considered a feature,…so it's something that some camera vendors hype.…

A digital image is composed of a group of pixels.…Each one of those pixels is a little sample…of the light that is bounced off of the scene…that you pointing your camera at.…Because those pixels are arranged in a regular grid pattern,…if you point your camera at something in the world…that also has a regular repeating geometric pattern,…it's possible that the interference…between those two regular geometric patterns,…the one out in the world and the one on your sensor,…