Panasonic AG-3DA1E Manual De Usuario

39

A human’s stereoscopic viewing takes advantage of 

the brain’s ability to process information from the left 

and right eyes of two images seen from their respective 

perspectives. The misalignment of the two images is called 

binocular parallax. 

Mainly binocular parallax is used by 3D equipment to 

create the feeling of stereoscopic images. When shooting, 

the images from the left and right lenses are misaligned 

because of the difference in the positions of the lenses 

as well as in the directions of the optical axes. This 

misalignment (called parallax) changes according to the 

distance of the subject being shot (illustration at right). 

If parallax is excessive, it is difficult to fuse the two images 

within the brain. This may produce a double image, create 

a feeling of strangeness, etc., causing eyestrain.  

Limiting the parallax appropriately during shooting is 

important for comfortable 3D viewing.

There are two guidelines for parallax.
A

  Parallactic angle for pop out: 1 degree or less

A parallactic angle is produced between the left and right 

lenses and the subject (illustration at right). It also changes 

according to the distance of the subject being shot.

It is usually said that a parallactic angle for pop out within 1 

degree is appropriate for comfortable 3D viewing.

Assuming that people view 3D images from a distance 

three times the effective height of the screen, a parallactic 

angle of 1 degree corresponds to misalignment of 

approximately 3 % the effective width of the screen. This 

leads to one of the guidelines for parallax, which is to limit  

horizontal misalignment to within 3 % the effective width of 

the screen.
B

 Parallax in depth: 50 mm or less

Parallax in depth is created when an image from the right 

lens is displayed to the right and an image from the left 

lens to the left on the screen. 

If the value of this parallax exceeds the pupil distance of a 

viewer, it will cause eyestrain.

In consideration of individual differences of viewers such 

as age and pupil distance, setting parallax to within 50 mm 

is preferable. 

Parallax in depth is related to screen size. For a 16:9 

screen, if the screen size is 77-type or less, limiting 

parallax to within 3 % the effective width of the screen 

means that parallax in depth will not exceed 50 mm. If the 

target screen size is 103-type, limit parallax to . %. For a 

00-type screen, limit parallax to 1.1 %.

The 3D guide function of this camera (Page 38) provides 

a rough guide of distance ranges from the subject for 

achieving appropriate parallax in two cases: for an intended 

screen size of 77-type or less, and for 00-type. Referring 

to the guide, change the layout of the subject or adjust the 

zoom and convergence, so that the subject can be shot 

within the distance range shown by the 3D guide function. 

Check the parallax value (% effective screen width), using 

a monitor.

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Extreme parallax between left and 

right images is demonstrated in the 

illustration above.

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Parallax: Approx. 3 % or less  

(any screen size)

Parallax: Approx. 3 % or less

Parallax: 50 mm or less