This is a difference of 10 years in camera lens design.

The right, released in 2002.
The left, released in early 2012.

Both Nikon 50mm primes, the newer one has aspherical optics and AutoFocus.

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@s the eldest also has autofocus isn't it?

@imvectech Yes and no.
The older is the f1.8D with no built in AutoFocus motor. But it will AutoFocus on DSLR bodies with a motor in the body.

They later brought out a 50mm with a motor in using the 2002 design before the 2012 model came out I think?

The newer one autofocuses on any body, motor or not.

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