Re: [photo-3d] Re: Medium Format Viewer

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

----- Original Message -----
From: "Don Lopp" <dlopp@xxxxxxxxxxxxxxx>
To: <photo-3d@xxxxxxxxxxxxxxx>
Sent: Monday, March 05, 2001 10:41 PM
Subject: Re: [photo-3d] Re: Medium Format Viewer


> ...I am at a total loss to understand why anyone
> would would build an expensive viewer with out an inter-ocular
adjustment...

So am I.  This feature should be standard on all viewers.

Not all people have exactly the same eye spacing.  The few millimeters
variance may seem insignificant, but not to those who are trying to view
off-axis because of this.

Another consideration is the amount of time spent viewing.  People who view
a lot of stereoscopic images tend to strengthen their eye muscles as a
result.  They then find viewing images that are not perfectly lined up
fairly easy and comfortable.  The same images could easily cause eyestrain
and headaches for people who are new to this exercise.

Perhaps if you are the only one using your viewer, and you only view slides
that you have mounted yourself, you will find a non-adjustable viewer
satisfactory.  But, if you ever view other people's slides, or other people
ever look into your viewer, you should seriously consider getting one with
an adjustable interocular.

Several years ago, I had a table at a local camera show.  The fellow with a
table across from me had a non-adjustable stereo viewer, that he was
demonstrating with some stereo slides that he had brought with him.   It
surprised me to see how many people looked into the viewer, and then closed
one eye!   When he told them to look with both eyes, common responses were
"I can't, it hurts my eyes", or "but then I see two pictures".  I often
wonder if such viewers were at least partially responsible for the decline
in stereo photography after the 1950's.

JR


 

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