Minimizing diffraction in images using a photodetector

[Phys12]

If I understand the phenomenon correctly; whenever we capture an image using a telescope, because the light that's emitted from a distance object acts like a wave, we notice a diffraction pattern in our image. Now, in the double slit experiment (I didn't create the image, excuse the "slot" typo), if we include a photo detector, the light stops behaving like a wave and we see it behaving has a particle. Can we construct a telescope with such a photoelectric photon detector to get rid of the diffraction?

 

[stefan r]

Can we construct a telescope with such a photoelectric photon detector to get rid of the diffraction?

I think no. The photo detector needs to be on the top screen in your picture in order to relate to a telescope image. If the
photodetector is in front of the lens you lose the magnification.