- #1
MotoMike
- 30
- 2
Hi
been a while, but you guys always square me away.
I've recently noticed that when a night time photo is taken with the aperture closed down, (higher f number) seen in the resultant image is a starburst radiating from points of light. The general wisdom is that it is cased by diffraction over the aperture blades. accepting that that is true, why does the resulting starburst exhibit the same number of spikes as the number of aperture blades if they are an even number, but double the number of spikes as the aperture blade number if they are an uneven number.
I've looked in the photo forums and though discussed it is not really explained.
Kind regards,
Mike
been a while, but you guys always square me away.
I've recently noticed that when a night time photo is taken with the aperture closed down, (higher f number) seen in the resultant image is a starburst radiating from points of light. The general wisdom is that it is cased by diffraction over the aperture blades. accepting that that is true, why does the resulting starburst exhibit the same number of spikes as the number of aperture blades if they are an even number, but double the number of spikes as the aperture blade number if they are an uneven number.
I've looked in the photo forums and though discussed it is not really explained.
Kind regards,
Mike