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> Greg Rudzinski wrote-
>
> "Even just the camera held to a single pane window surface and cocked
> slightly would create multiple reflections."

And I had commented-
>
> Not if the glass itself has its surfaces parallel, in which case, for an
> object seen at infinity, the two images coalesce exactly, just as they do
> in
> the case of the two reflections from a back-silvered sextant mirror.. Such
> a
> displacement as Greg describes calls for some degree of "wedginess"
> between
> the surfaces.

Now Greg replies-

"If you can get your hands on a DSLR digital camera with a clear UV
filter screwed snug to the lens then look through the view finder at a
bright desk lamp through a window with the front of the lens touching
the window and tilted to one side or the other then you will see the
displacement effect. "

Yes, indeed you will, in the case of the close-by desk lamp. But not in the
case of an object at infinity, such as the Sun (as I wrote).  Greg should
try the experiment to see.

George.

contact George Huxtable, at  george@hux.me.uk
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


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