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Forum: Optics Theory - 02-05-2019
Replies: 57
Views: 3,210
Posted By michaelwj
In X-ray microscopy (my field) we have two (main)...

In X-ray microscopy (my field) we have two (main) ways to focus X-rays.
The first is a Fresnel Zone Plate, which is a refractive lens. The focal length is a function of the X-ray wavelength,...
Forum: Optics Theory - 02-04-2019
Replies: 57
Views: 3,210
Posted By michaelwj
"ASPH" or "Aspherical" on a lens denotes it...

"ASPH" or "Aspherical" on a lens denotes it contains an aspherical surface. You can't just brand a lens as such without an aspherical surface (you can I suppose, but it'd be lying). It used to be a...
Forum: Optics Theory - 02-04-2019
Replies: 57
Views: 3,210
Posted By michaelwj
It simply means that one surface of one element...

It simply means that one surface of one element doesn’t have a single radius of curvature. As in, it’s not spherical.
As far as better? It usually means the lens designer can replace multiple...
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