Diffraction Limit

Started Aug 28, 2013 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: Diffraction Effects in a Real Lens-Camera System

GeorgianBay1939 wrote:

Anders W wrote:

Steen Bay wrote:

Anders W wrote:

LTZ470 wrote:

Steen Bay wrote:

LTZ470 wrote:

I learn by "concrete proof in the pudding"...there is none for the FZ200 being diffraction limited at f/2.8...

But if it was (for example in the center of the image), then that would actually be a good thing! If a lens is "diffraction limited" (has its peak resolution) wide open, then that just means that it's a very good lens without any significant aberrations, where the resolution mostly will be limited by the unavoidable diffraction.

IF or CONCRETE...I'll stick with concrete...and the fact that there is no concrete proof...

So, if Panasonic came out with a successor to the FZ200 and the succesor were the same camera in every way except that it had a new lens that was "diffraction limited" already at f/2.8, which version would you prefer: the old one or the new one?

Though, maybe Panasonic shouldn't use the term "diffraction limited" in the advertising.

Why not? "Limited" seems to be a rather viable term in marketing speak. Certain Pentax and Oly lenses come to mind for example. And "diffraction" sounds rather advanced, doesn't it. Besides, Canon is already using the term in its lens marketing. Diffractive optics. Great stuff.


I know that you are having some fun here Anders. But I went to the site and scrolled down to Diffractive Optics . I first thought this was marketing of interference coatings, but when looking at the illustration

Diffractive optics: http://www.usa.canon.com/cusa/consumer/standard_display/Lens_Advantage_Perf#f

... and reading this:

"Canon has also developed a triple-layer type DO lens that uses an advanced diffractive grating to deliver excellent performance, with superior control of color fringing."

That looks like concentric diffraction gratings, like a diffracting (instead of refracting) Fresnel lens.

This will warm the cockles of the hearts of those who believe the ideology that in-lens corrections are superior to software corrections.

Now back to the other form of diffraction, your regularly scheduled program ....

Hi Tom,

I was just playing around with the words. I am well aware of what diffractive optics à la Canon actually is. If I hadn't already been interested in that from a more serious point of view, I wouldn't have remembered the label, and wouldn't even have come to think of the little word play it allowed in the present context.

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