Mailinglist Archives:
Infrared
Panorama
Photo-3D
Tech-3D
Sell-3D
MF3D

Notice
This mailinglist archive is frozen since May 2001, i.e. it will stay online but will not be updated.
<-- Date Index --> <-- Thread Index --> [Author Index]

[photo-3d] viewer lens spacing (was Re: medium format viewers)


  • From: "Alan Lewis" <3-d@xxxxxxxx>
  • Subject: [photo-3d] viewer lens spacing (was Re: medium format viewers)
  • Date: Wed, 7 Mar 2001 06:41:49 -0600

>> Adjusting your viewer lens spacing when viewing a monolith (single) stereo
>> mounted image does not align your eyes with the image.

>Of course it does not align your eyes with the image.  It aligns the lens
>centerlines with the spacing of the eyes.

If this is the case then one only needs to adjust a viewer once in their lifetime, since their eye spacing does not change once they reach adulthood.  So I am assuming that you don't use the adj. lens spacing feature anymore on your viewer since you have done the single adj. necessary to match the lens centerline to your eye spacing.

What I normally encounter is people adj. the viewer lens spacing whenever they are having trouble fusing a stereo image.  If your physical eye spacing is not changing then what is changing?  The infinity separation is changing on the mounted slide. The lens spacing is trying to correct for changing image spacing in the mount, not match your actual eye spacing.

I think there is one condition where one adjustment would actually work.  If one's eye spacing is equal to or greater than the maximum infinity separation on a mounted slide then they should be able to comfortably view just about any slide after adjusting the viewer lens spacing just once in their lifetime.  They would always be viewing by slightly converging their eyes, and this is normally OK.  This would be the same thing as fixing the viewer lenses at the maximum infinity separation of the typical mounted image.

If one's eye spacing is less than the typical maximum infinity separation on a mounted slide and the viewer lens spacing is set to equal the person's actual eye spacing then they would always be slightly diverging their eyes to fuse the image.  This is not normally OK.

The real issue is mounting standards, not adj. viewer lens spacing.


Alan Lewis
3-d@home.com
Serious viewers for serious Viewers
http://members.home.net/3-d


[Non-text portions of this message have been removed]


 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/