Full featured slow shutter camera for iPhone
Features and quality are top notch. If you want full resolution and exposure control, this app is it.
The only reason I didnt give five stars is because there is no handheld mode (which would require image stabilization and special algorithm), but if you want slow shutter photos youd normally be using a tripod in which case this app shines.
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Slow Shutter Cam, v2.1