how do camera lenses have a “resolution” and a mega pixel count?

Question

I get details can be blurry on a bad lens but how is this like pixel resolution?

CCTV lenses are often 1-5 megapixel lenses. How can a lens have a mega pixel count?

What does it mean for a lens to “resolve” more detail? Is this just about sharpness?

Also when buying DSLR lenses how can you tell what their resolution will be?

Thanks 🙂

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Answer 1

In photography for example ,there is something we call perceptual megapixels. Let’s say you have camera with 10mp sensor ,if you put some cheap lenses on it you will get for example 4 perceptual megapixels,if you put the best lenses you will get 8-9 perceptual megapixels. The 10 megapixels of detail is what you will get if you had the perfect lenses (which doesn’t exist)