Subject: Why does corona around the moon look less vivid when viewed thru binoculars

I was looking at the moon on a slightly 
foggy night, and there was a wide halo 
around the moon, somewhat rainbow 
like, presumably from the fog.  But 
when I looked at the moon again 
through binoculars, the corona did not 
look nearly as bright, colorful or big.  
Why?

Re: Why does corona around the moon look less vivid when viewed thru binoculars