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Furthermore, with two optical sensors, it is also possible to know how much exposure bias occurs between the right and left (or top and bottom) of the image plane. Based on this information, you can decide whether to increase (or decrease) the tension of the front curtain or the rear curtain.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.