T3D Re: 30:1

["John Goodman" <jgood@xxxxxxxx>]

On 21 May 99, at 10:38, John B. wrote:

> >> A translation of the object by 1/30 of the field of view should
> >> also work.  Translations should work better than tilt, but hey, 
> >> what kind of vacuum stage do you have?
<snip>
> OK, question, what is the focal length and field of an
> electron microscope?  I realize these are variables but
> then what is the range?

If translation is not effective, what's the drawback of tilt or 
rotation? A friend says his archeological artifact stereo 
microphotography is very effective, where the camera is 
fixed and the objects are rotated by 6 degrees between 
shots. I imagine that the background is neutral and not a 
factor. However, I can't visualize the changes in stereo 
view as the axis of rotation varies with reference to the 
optical axis.

J.Goodman


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End of TECH-3D Digest 492
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