Secondary apertures along the sutures may also be found.
2.
The primary aperture is commonly on the interior margin and secondary apertures are commonly along the sutures.
3.
Globigeninoid ( look like Globigerina ) forms from the Cretaceous differ in the placement of the aperture and nature of secondary apertures.
4.
Practical lens assemblies may also contain mechanisms to deal with measuring light, secondary apertures for flare reduction, and mechanisms to hold the aperture open until the instant of exposure to allow SLR cameras to focus with a brighter image with shallower depth of field, theoretically allowing better focus accuracy.
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