If you don't already have it ... Download the filmicpro app.
It'll give you far greater control over the phones camera.
Thing is it's very power hungry and kills the iPhone battery in no time.
Also be careful with the phone if you keep it in your back pocket.. A Work colleague, whilst leaning against a table managed to break his screen... Not covered by warranty.
'No longer are the pleasures of Home Movie Making limited to those with ample funds. Now the man and woman of moderate means can join the sport'..... Kodak catalogue 1933