"jeff" wrote in message
. ..
redbeard wrote:
"jeff" wrote in message
...
Wilbur Hubbard wrote:
Jeff's photo showed data acquired in x-rays. There is *NO* lens
involved in x-ray photography. Please do not feel stupid
because you did not know this. I'm sure that you are not
alone.

Tell these guys:

http://www.iop.org/EJ/abstract/0022-3727/38/10A/042

http://www.patentstorm.us/patents/7289597/claims.html

http://query.nytimes.com/gst/fullpag...C0A9679582 60

http://tu-dresden.de/die_tu_dresden/...ch/xray_lenses

http://www.ifg-adlershof.de/linsen.htm

When my dentist points that lens-looking think at my mouth and it
buzzes it directs the x-rays just where they need to go. It might not
be a GLASS lense but there's got to be a lense of some sort in there.

No, that type of x-ray picture doesn't use a lens. Think about it.
Here's a hint: if the thing the dentist points at you bounces around
during the exposure, it doesn't affect the picture.

Not so. The xray machine is the source of illumination and the xray plate
is a stationary receiver and not attached to the machine. IIf the plate
moves during the exposure, the picture is fuzzy, just like a camera.

Once again, Wilbur is correct.

If the x-ray did not have a "lens", why is it aimed at all?

Here's a lens part number for a GE dental xray machine:

http://answers.yahoo.com/question/in...4063732AATtXgz

Not so. If you move your head (or the x-ray machine head) but hold the
little photographic plate firmly against your teeth, the exposure will be
fine. The tube simply creates an un-focused, though somewhat columinated,
blast of x-rays. The sharp image is the result of the detector plate
being close to the teeth. (Actually the x-rays are created in the head,
the tube is there prevent too much scatter and to keep the target a safe
distance from the source.)

You're right. I was thinking of xrays of broken arms, etc. In dentistry the
plate is held motionless relative to the teeth. Here's an actual x ray of my
head:

http://sleevage.com/wp-content/uploa...mpson_xray.jpg