# Why is the edge of the light from my flashlight beam so blurry?

somega

On the photo you can see:

Red 1: the edge is very sharp (as expected)
Red 2: the edge is very blurry (but why?)

Same for green.

You can also see (Red 2) that the blurry edge is yellow.

What is this effect called?

View attachment 259524

On the photo you can see:

Red 1: the edge is very sharp (as expected)
Red 2: the edge is very blurry (but why?)

Same for green.

You can also see (Red 2) that the blurry edge is yellow.

What is this effect called?
Green: Because the light source is not a single point, the shadows are blurry.
Red: Same as green but also:
https://en.wikipedia.org/wiki/Chromatic_aberration

davenn and Lnewqban