Let’s assume we have three 16:9 monitors:

• 24 inch 1080p 540 Hz
• 27 inch 1440p 360 Hz
• 32 inch 2160p 240 Hz

Generally, one would move the 27 further away than the 24 and the 32 further away than the 27 to have all 3 fill out the same space in one’s field of vision.

The minimum panning speed is 1 pixel per refresh cycle, which means the only possible panning speeds are multiples of each refresh rate, e.g.:

• 540 Hz: 540, 1080, 1620, 2160 etc. px/s
• 360 Hz: 360, 720, 1080, 1440 etc. px/s
• 240 Hz: 240, 480, 720, 960 etc. px/s

If we convert these to monitorWidth/sec, we get:

• 540 Hz: 0.28125, 0.5625, 0.84375, 1.125 etc. mWidth/s
• 360 Hz: 0.140625, 0.28125, 0.421875, 0.5625 etc. mWidth/s
• 240 Hz: 0.0625, 0.125, 0.1875, 0.25 etc. mWidth/s

The matching speeds are:

• 540 Hz: 1080 px/s (0.5625 mW/s) or 2160 px/s (1.125 mW/s) etc.
• 360 Hz: 1440 px/s (0.5625 mW/s) or 2880 px/s (1.125 mW/s) etc.
• 240 Hz: 2160 px/s (0.5625 mW/s) or 4320 px/s (1.125 mW/s) etc.

Since it’s impossible to standardize this due to the vast amount of different refresh rates and aspect ratios, you should clarify the panning speed and resolution used in each motion shot. Ideally, include the information in the picture itself, so people can share them out of context.