PentaxForums.com - View Single Post

creampuff · 12-26-2008, 07:37 AM

The rings in the out of focus circles are characteristic of lenses that have aspherical lens elements. The aspheric lens element has subtle changes of the lens curvature where the edges are flatter to correct spherical aberration.

12-26-2008, 07:37 AM	#6
creampuff Pentaxian Location: Singapore Gallery Photos: 32 Posts: 2,100	The rings in the out of focus circles are characteristic of lenses that have aspherical lens elements. The aspheric lens element has subtle changes of the lens curvature where the edges are flatter to correct spherical aberration.