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or 0.7% Therefore the Native Parallax of a 30 foot screen is 0.7%, so we should make sure to keep our

maximum positive parallax under 0.7% of screen width if we plan to show our footage on a 30 foot

wide screen. If we shoot for a 65" 3DTV, then we can get away with over 3% positive parallax.

The 1/30th Rule

The 1/30 rule refers to a commonly accepted rule that has been used for decades by hobbyist

stereographers around the world. It basically states that the interaxial separation should only be

1/30

of the distance from your camera to the closest subject. In the case of ortho-stereoscopic

shooting that would mean your cameras should only be 2.5" apart and your closest subject should

never be any closer than 75 inches (about 6 feet) away.

Remember that illustration on page 3 of the eyes pointing outward (diverging)? Well it isn't natural

for humans to diverge and therefore the maximum positive parallax when displayed should not

exceed the human interocular of 2.5 inches (65mm.) You can readjust the convergence point and

bring the maximum positive parallax within the limits of the native display parallax (2.5 inches) but

that will also increase your negative parallax.

XF300/305 Whitepaper

Tim Dashwood

Interaxial x 30 = minimum object distance

Minimum object distance ÷ 30 = Interaxial

If you are using a couple XF305 cameras in a side by side rig as

close as they will t together (6 inches) then the calculation would

look like: 6" x 30 = 180 inches or 15 feet. That's right... 15 feet!

But does the 1/30 rule apply to all scenarios? No, the 1/30 rule

certainly does not apply to all scenarios. In fact, in feature lm

production destined for the big screen we will typically use a ratio

of 1/60, 1/100 or higher. The 1/30 rule works well if your nal

display screen size is less than 65 inches wide, your cameras were

parallel to each other, and your shots were all taken outside with

the background at in nity. When you are ready to take the next

step to becoming a stereographer you will need to learn about

parallax range and the various equations available to calculate

maximum positive parallax (the parallax of the furthest object,)

which will translate into a real-world distance when you

eventually display your footage.

Stereoscopic 3D