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In order to maintain pixel counts smaller sensors will tend to have smaller pixels, while at the same time smaller objective lens f-numbers are required to maximise the amount of light projected on the sensor. To combat the effect discussed above, smaller format pixels include engineering design features to allow the reduction in f-number of their microlenses. These may include simplified pixel designs which require less metallisation, 'light pipes' built within the pixel to bring its apparent surface closer to the microlens and '[[Back-illuminated sensor|back side illumination]]' in which the wafer is thinned to expose the rear of the photodetectors and the microlens layer is placed directly on that surface, rather than the front side with its wiring layers. The relative effectiveness of these stratagems is discussed by [[Aptina]] in some detail.<ref>{{cite web|last=Aptina Imaging Corporation|title=An Objective Look at FSI and BSI|url=http://www.eetrend.com/files-eetrend/newproduct/201101/100029156-17249-fsi-bsi-whitepaper.pdf|work=Aptina Technology White Paper|access-date=29 January 2012}}</ref>
==[[Common]] image sensor formats==
[[File:SensorSizes.svg|thumb|300px|right|Sizes of sensors used in most current digital cameras relative to a standard 35 mm frame.]]
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