1. Numerical apertures as high as 1.6 can be achieved.2. Microscope objectives are characterized by two parameters : magnification and numerical aperture . 3. Oil immersion objectives typically have even larger numerical apertures so improved optical sectioning. 4. Numerical aperture is not typically used in photography.5. Microscope objectives are characterized by two parameters, namely, magnification and numerical aperture . 6. Numerical apertures as high as 1.6 can be achieved with oil immersion.7. This can be obtained by using an objective with a numerical aperture greater than 1. 8. In multimode fibers, the term " equilibrium numerical aperture " is sometimes used. 9. The larger numerical aperture allows collection of more light making detailed observation of smaller details possible. 10. Usually, high numerical aperture objectives are also used to capture the maximum emission light possible. 
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