Shoot at 24 or 25 fps. Set the shutter to double the frame rate: 1/48 or 1/50. This is the 180-degree shutter rule.

Use it when. Always, unless you want a jittery, crisp look for a fight or a panic. Then go faster, on purpose.

On the phone. The stock camera app picks its own shutter and changes it as the light changes. Use an app that lets you lock it.

ISO is the sensor’s gain. Higher ISO brightens the image and adds grain, especially in shadows.

Use it when. Keep it as low as the light allows. A phone looks clean up to about ISO 400 and rough past 800.

On the phone. If the shot needs ISO 1600, the answer is a lamp, not the ISO slider.

Dark glass on the lens. It cuts the light without changing colour, so the shutter can stay at 1/50 in daylight.

Use it when. Every daylight exterior. Without it the phone forces a fast shutter and the motion looks like a phone video.

On the phone. A clip-on variable ND is the one outdoor accessory that matters. Indoors you will rarely need it.

The colour the camera calls white. Daylight is blue, tungsten bulbs are orange, LED panels are set by you.

Use it when. Pick one setting for the scene and lock it. Auto white balance drifts between takes and the cut shows a colour jump.

On the phone. Match the lamps to the window or cover the window. Mixed light is the hardest thing to fix later.

Exposure in video is set once and held. Lock shutter, ISO, white balance and focus before the take.

Use it when. Every take of a scene should match every other take. Locks are what make cuts invisible.

On the phone. A manual camera app gives you the locks; several are free. In the stock app, press and hold to lock focus and exposure at least.