that's a rough approximation that makes some assumptions about the MTF curves. in particular, one critical assumption is that all of the components you are combining have the same shape of MTF curve but may differ in the spatial frequency at 10% response point. this usually isn't true, but isn't horribly wrong either.
Herb... ----- Original Message ----- From: "William Robb" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, March 09, 2004 9:03 PM Subject: Re: *ist D sensor and 35mm lens resolution > I invite a look at: > http://medfmt.8k.com/mf/lenslpm.html > and look at the section: > Calculating System Resolution > where the fellow shows that system resolution is less lens dependent > than we would care to think. > > > system resolution = 1 > (lpmm) ------------------------------------------- > ( 1/lens lpmm) + (1/film lpmm)... > Do the math.
