Slow Motion Video Capture

I'm not sure about iOS but on Android this tends to be a limitation of the Camera API which limits what camera functionality is actually exposed to developers.

That is just changing the playback speed, not enabling slow motion capture.

There is nothing called slow motion capture.

The easy way is to buy a cheap high speed camera (250 fps), and use a free pc program called kinovea to play back in very slow speed.

Alternative import the video from mobile and play back in slow speed.

How good it will be will depend on how many frames per second Your mobile camera can record in.

 Cell phones do have modes explicitly called slow motion, or sometimes high speed capture. The OP was asking how to use that mode from their phone with the R10.

No matter what they call it as long as we agree that no camera can capture anything in slower motion than the actual speed the motion is performed in.

How many frames per second a camera captures will determine how slow the playback can be.

If a camera captures one frame per second, then Your swing is over before next frame is captured.

If a camera can capture 250 frames per second, then playback can show 250 "pictures" per second of video, and this can be slowed down to frame by frame if You want to, and appear as very slow motion.

"No matter what they call it as long as we agree that no camera can capture anything in slower motion than the actual speed the motion is performed in."

I'm not sure what this is supposed to mean. The actual motion is continuous, there is no such thing as frames per second in the actual motion. A camera could capture a tortoise sleeping at a trillion frames per second and it still wouldn't be "slower motion than the actual speed the motion is performed in". Playback can most certainly be slower than we natural perceive it be however.

"How many frames per second a camera captures will determine how slow the playback can be."

Sort of, you can capture a golf swing at 24fps and play it back at 1 fps, you just won't have enough temporal resolution for that playback to be particularly useful. But yes, higher framerate capture is pretty much always preferable for any kind of movement analysis, hence why you would want to be able to access the slow motion/high speed modes that pretty much any android or iOS devices is capable of. The problem is that those camera readout modes are generally not accessible through the default camera APIs available to developers (at least on Android when I originally wrote that response.)