Looking at the image below, the convergence and focus point is set to the first newel post, and the forward banister rail has excessive divergence where it exits screen (as the banister rail is exiting screen so close to the camera it is always likely to suffer such issues, unless the inter ocular distance is set a lot smaller).

In this following image the convergence point has been moved close to where the banister rail exits screen, while the point of focus is still the newel post.

This raises an interesting point as the point of focus is still on the newel post, while the point of convergence is now on the front portion of the banister rail.

The point here is that some people suggest that focus and convergence should be locked - but as can be seen here there are very valid reasons why the two shouldn't be linked: ignoring the fact that shallow depth of field can limit the 3-D experience as it reduces the ability for the whole stereoscopic effect to be enjoyed by both eye and brain.

See focus later for an example of this potentially limiting effect.

Yet another effect of moving the point of convergence further forward is it also lengthens the apparent distances between objects, as well as the length of the objects themselves (much as moving further away from the screen has the same effect, as discussed in Viewing Distance), and is obvious by comparing the above images.

This needs to be understood during shooting as if changes are going to be made in post the result can be unexpected when seen edited within non-effected shots.

Next Page - Cut-Out Appearance

As always, test before committing to a particular style of stereoscopic 3-D shooting.

Or better still, contact steve@lightillusion.com for more info.