well of course, if you understand how diffraction spikes work they can be utilised to your advantage just like the bat mask.
with diffraction spikes like on a 4 vane secondary holder, it all most looks like a hash key when coming in, those spikes get closer until they visually form one spike. But for me its the colours that i look for that tells me more about my collimation than anything else. When you are spot on then you get red green blue red green blue of course if you have diffraction spikes from one side of the screen to the other that is best
