Re: [photo-3d] Pulfrich

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

Actually, I think you might enjoy the images even more if you were to switch
the filter position according to direction (see my previous post on the
"lollipop" Pulfrich viewer.

Strong monoscopic depth cues can sometimes override the stereoscopic.  If
you "know" that a particular subject is closer than another by all of the
monoscopic cues, the brain will ignore the stereoscopic in preference to the
overwhelming number of monoscopic.

In a football game, even with the teams moving in one direction, one player
may circle around to get into a better position, such as to be in the right
place to catch the ball if it is passed to him.  We do not notice the pseudo
effect that the Pulfrich glasses produce, because our attention is on the
general flow of the action.

Actually, a football game is very good for Pulfrich since most of the action
is in the same direction most of the time.  Other games, like basketball or
soccer, require more attentiveness to switching the filters, and often
present visual problems because one player frequently is moving in one
direction, while another player frequently is moving in the opposite
direction.

Nevertheless, I think you will find the results overall more realistic if
you change the filter position with each change of direction.

JR

----- Original Message -----
From: <markaren@xxxxxxxxx>
To: <photo-3d@xxxxxxxxxxx>
Sent: Sunday, October 29, 2000 9:33 AM
Subject: [photo-3d] Pulfrich


> The easiest way to demonstrate the pulfrich effect is to watch an NFL
> game while wearing a pair of sunglasses with one lens removed. Since
> there is strong diaposing latteral movement ( 2 teams moving in opposite
> directions) it does not matter which lens is removed, and of course
> there is no " pseudo" effect experienced. Especially effective are
> zoomed scenes as the camera follows a player toward the huddle, passing
> by other players and officials etc. Since I'm enjoying DSS broadcasts of
> the games, I suspect the clarity of the signal enhances my enjoyment of
> the effect.
>                                             Mark Dottle
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