tested point source

Tested the point-source light. I.e. the fiber-optic-lamp-in-a-box.

First image looked good: the camera could see it.

Focus mask installed.

The diffraction pattern was there!

I could not see the diffraction pattern on the camera back or on the computer screen in Live View. Had to shoot a long exposure to draw it out. So I think that's because it is too dim. Is there are issue with the spectra?