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==Exposure index== [[File:Cinestill 800Tungsten Xpro C-41 135 film cartridge (01).jpg|thumb|A roll of [[Cinestill]] 135 color film showing checkboxes that can be used to remember the EI for push-processing (expressed in [[Exposure value|stops]] relative to the box speed of ISO 800/30Β°).]] When a film's effective sensitivity has been varied, the resulting sensitivity is called the [[exposure index]]; the [[film speed|film's speed]] remains at the manufacturer's indication. For example, an [[Film speed|ISO]] 200/24Β° film could be push processed to EI 400/27Β° or pull processed to EI 100/21Β°.
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