On 2011-04-06 08:13 , Matthew Hunt wrote:
On Wed, Apr 6, 2011 at 10:06 AM, steve harley<[email protected]>  wrote:

a thought experiment: if you aimed a soft-focus lens at just the right
concave surface, would everything be sharp? i think there'd still be more
going on

You're confusing spherical aberration with field curvature.

actually i was just taking at face value the terms and diagrams on Mark's post

your wikipedia reference helped clear it up for me (so to speak)

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