The numerical aperture of a microscope objective is a measure of its ability to gather light and resolve fine specimen detail at a fixed object distance.
Imaging Interferometric Microscopy - improved resolution by roughly a factor of two when compared with high numerical aperture imaging approaches while retaining field-of-view, depth-of-focus and working distance of low NA objective.
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Scientech 2515 Mode Characteristics in Fiber Optics experimental setup has been designed to study the mode characteristics of different fiber optic cables. The two basic types of fiber, Single Mode and Multi Mode can be characterized by measuring Numerical Aperture and the Normalized Frequency (V number) parameter, which guides modes that are allowed to propagate in a particular waveguide structure. When V<2.405, only single mode propagates in the waveguide and when V>2.405, the other modes…
Corning's HI 1060 fiber features high numerical aperture and high core index of refraction.
Depth of Field Explained -- My only criticism is that around 3:20 he puts up a chart showing the relationship between the aperture and the shutter speed. He speaks about raising and lowering the shutter speed speaking of the numerical value which bears an inverse relationship to the speed. That is 1/500th of a second is half the duration of a shot taken at 1/250th of a second, but he speaks of lowering the shutter speed when you go to 1/250th. That's bound to confuse some of the…
Holographic Microscopy: Peering Into Living Cells. images of living cells can be obtained in just a few minutes. "Being able to capture a living cell from every angle like this lays the groundwork for a whole new field of investigation" ~ScienceDaily