Re: [ATM] testing flats with a green laser

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

We held the laser right over the flats, about a foot or 2 above them, with the laser-and-frosted-cylindrical-blank arrangement aimed right at them.
Didn't take a picture, sorry,

Hugues.Laroche@ses-astra.com wrote: Hello Guy,


>and Jim happened to have a GREEN laser pointer. We found a couple of 
small Korean-War era lens blanks that one side >frosted, shone the laser 
through the frosted blanks, putting all of this into a darkened room, and 
the interference >fringes showed up well. Not as good as in my little 
monocrhomatic light box, but well enough for everybody to see them. 

I am not sure I understand how in details your setup was done.
Traditionally, the flats are lying horizontally with light source directly 
above.
 Is it what you did? Or did you for example lighten up the ceiling with 
the "frosted" lenses?
Also, I never saw "frosted" lenses, who would one be interested in such a 
thing, so I guess it's hard to find? 
On the other hand I can well imagine that you may easily replace those?

Clear skies,

Hugues




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Guy Brandenburg, Washington, DC
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