Why are lenses circular but photos rectangular?

Why are lenses circular but photos rectangular?




Why are lenses circular but photos rectangular?


   Even though lenses are circular, why are photos captured rectangular in shape? This is the answer: 

Why are lenses circular but photos rectangular?

  Lenses being circular, capture circular photos only. These circular photos then pass through a sensor which is rectangular in shape which makes photos rectangular. Thus, photos are rectangular. This sensor isn't circular because circular photos will look weird.

Why aren't lenses rectangular then?

  Rectangular lenses will cost more for production than for circular ones. Thus lenses aren't circular.
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