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Lecture 16: Camera & Lenses Cont. (27)

While an ideal thin lens is a useful theoretical construct, it does not exist in reality. Real lenses always have some degree of imperfection due to the finite thickness of the lens and the material properties of the lens. The main difference between a real lens and an ideal thin lens is that a real lens has a finite thickness and is made of a material that has a refractive index different from that of air, while an ideal thin lens is a theoretical lens with zero thickness and no material properties.


Something I've looked at in the past is camera distortion and I'm curious how much correction can be done in the actual hardware surrounding the lens. It seems like so much research has gone into lens but distortion still exists.


For a lot of physical things engineers just have to work past them. It's like noise in a system -- it's usually always there but we can alleviate it with the right techniques.


What are some of the situations where the ideal thin lens model is a good approximation of the behavior of a real lens


Additionally, we can correct distortions mathematically and programmatically by calibrating the lenses and characterizing them. This happens quite a bit in the field of computer vision!


To answer bbcd0921's question above, Tte ideal thin lens model is a good approximation of the behavior of a real lens in several situations including: when the lens is thin, when the lens is made of a single material, when the object distance is much greater than the lens focal lens.

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