obstruction in telescope

Hi all,

Let's assume we observe a star with a perfect telescope. Parallel light is
falling into the telescope, and the Airy disk is exactly on the optical
axis.
Now let's assume this telescope has a central obstruction, which reduces the
intensity of the Airy disk and makes the diffraction rings a little
brighter.
My question: What happens if we move the central obstruction further away
from the telescope, while keeping it exactly on the optical axis? Are there
any changes in the diffraction rings, or not?

Thanks,
Michael


.

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