This can be obtained by using an objective with a numerical aperture greater than 1.

These objectives have a high numerical aperture which gives a small depth of field.

The bigger the numerical aperture, the smaller the focal spot.

The numerical aperture of cedar tree oil objectives is generally around 1.3.

State of the art objectives can have a numerical aperture of up to 0.95.

In laser physics, the numerical aperture is defined slightly differently.

There is one other possibility: increasing the numerical aperture of a normal microscope objective.

Usually, high numerical aperture objectives are also used to capture the maximum emission light possible.

A high numerical aperture objective is also required.

A high numerical aperture (equivalent to a low f number) gives a very shallow depth of field.

Numerical apertures as high as 1.6 can be achieved.

Manufacturers have also introduced ever larger and more expensive lenses as a means of increasing the numerical aperture.

In multimode fibers, the term equilibrium numerical aperture is sometimes used.

Configurations with a high numerical aperture can measure on relatively steep flanks.

Numerical aperture is not typically used in photography.

Microscope objectives are characterized by two parameters: magnification and numerical aperture.

Numerical aperture is used to define the "pit size" in optical disc formats.

Efforts to improve resolution by increasing the numerical aperture have led to the use of immersion lithography.

The larger numerical aperture allows collection of more light making detailed observation of smaller details possible.

Based on the diagram at the right, the image-space numerical aperture of the lens is:

If the space between the objective lens and the specimen is filled with oil however, the numerical aperture can obtain values greater than unity.

The critical angle determines the acceptance angle of the fiber, often reported as a numerical aperture.

The lens needs to be large enough to support the full numerical aperture of the fiber, and must not introduce aberrations in the beam.

Solid immersion optics (allowing an extremely high numerical aperture).

According to this equation, greater resolution can be obtained by decreasing the wavelength, and increasing the numerical aperture.