Make long-exposure photos from existing Live images. Have a look through your library to see if you already have other images that would work for long-exposure photos.

A typical night-shot long exposure would be 100 ISO, f/16 or f/22, for 30 seconds. But an iPhone doesn’t provide the control needed for this, so the only way to take long exposures is software ...

Your iPhone can already take beautiful, dreamy long-exposure photos. Here's how to do it. I Love This Hidden iPhone Camera Trick for Stunning Long-Exposure Photos - CNET ...