Spike Spread (K) - Sets how quickly spikes will spread out as the distance increases from the highlight Spike Spread Control

Click the control or press K to activate.

The Spike Spread control, part of the Main Diffraction Spikes group, allows you to make the Primary and Secondary Spikes diverge as the distance from the highlight increases.

Higher Spike Spread values make the spikes spread more and be more "fan" shaped.

Note that with this control turned all the way down the Primary Spikes will stay equally sharp at all distances. The Secondary Spikes will still diverge a bit.