re: 3Discover

[P3D Dr. George A. Themelis <fj834@xxxxxxxxxxxxxxxxxxxxx>]

Honest Jacob the kiddder who should not be kidding with Dr. T's email
account and signature, writes:

>Here is another simple hacker improvement that can be done. You mention
>it has inter-ocular adjustment. Yes that is true but is limited to 2
>positions on each side, for a combination of 4 different spacings. The 
>spacing provided were not suitable for me and what I did was dremel
>out one more notch inside the viewer so that it has 3 positions. This
>works well for me and others.

Note:  There are 2 positions in each lens but the different spacings are
only 3, as follows:  Wide (both out), Medium (one out, one in, depending
which one is out and which one is in this will shift the image but will not
change the spacing) and Short (both in).

Now, I think (will have to double-check this) that only the short position
matches the infinity separation of the images which is smaller than usual. 
Use this setting for a child.  When adults use this setting then have a
slight problem because their eyespacing is larger and the lenses are rather
small.

Using the wide spacing will match the adult's eyespacing but now the lenses
are not centered with the chips.  Hence the complains by Gabriel that he
cannot see the entire frame.  Your best chances to see the entire frame is
to use the small spacing and push your eyes closer together ;)

I believe most adults will chose the medium setting.  I am not sure where
Gabriel drilled his third notch and why.

This viewer is good study of the interaction beteween eyespacing and image
spacing.

> Another simple improvement which I have done
>is to put a jack so that an DC adaptor can be used with it.

For the motor, I assume?  This is a fine portable viewer and a pair of AA
batteries seems to be lasting for a long time.  Why would you want to
immobilize yourself to save a few pennies?  And how many cassettes do you
own that you use it so often yourself?  Once you looked at each a couple of
times you are done.  Am I missing something?

George.


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