RE: EOS EF 400mm f4 DO

[p . wagemans]

"Sir Douglas the Fearless" wrote:

> you should see in the front of the lens, you can see the diffracting
> rings.

Can you tell more about the area in which you can see those rings and
their spacing? I'm curious about how diffractive it is.

Seeing the rings also makes me wonder about contrast with strong light
sources in the picture: it means that light gets scattered by the
ridges.

Regards,

Peter Wagemans
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