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For long exposures, just press the release button fully and slide it into the locked position. The shutter will stay open as long as the shutter release button is locked. To unlock the shutter, just slide the release button back to its original position.
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.