If you want something lighter weight with manual controls and a much longer history I highly recommend the iOS app "Camera M". Unfortunately Apple restricts so

If you want something lighter weight with manual controls and a much longer history I highly recommend the iOS app "Camera M". Unfortunately Apple restricts some control of the hardware only to the official iOS camera app so in some cases you are actually best off tweaking the built in app as much as possible. I believe Camera M actually has some details about this on their support page and FAQ. One time fee - often updated - no subscription. The UI isn't fancy but it does everything well and I've found their email support responds quickly and enthusiastically.