Re: Possibly another polarized light souce awaiting application

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You're absolutely correct! As usual. Oriented properly, the screen turns black.

Roger

On 26 Feb 2009, at 2:58 PM, ADavidhazy wrote:

Roger,

Are you sure you looked at the screen with the circular polarizer in the correct position? If "backwards" then the 1/4 wave plate "depolarizes" the beam from the LCD and not much of an effect will be perceived no matter how you turn the
filter.

I looked at a 20" Apple LCD monitor and it went pretty black. Must admit I used a single, straight, polarizer but a circular one should behave exactly the
same way if oriented correctly.

my $.01 worth!

andy


Roger Eichhorn wrote:

I just looked at my 15" Powerbook screen and my 20" Apple monitor through a circularly polarizing filter. The effect is very slight, ranging from a light tan to a light blue depending on orientation. However, a roughly square piece of 1/8" thick Lexan, with two holes drilled in it, when viewed through the filter with the laptop screen as a light source, shows prominent birefringent effects. Flexing the Lexan slightly increases the effect as the stress increases. I'm not familiar enough with the technique to know whether or not it's suitable for analysis of stress concentrations.
Roger
On 26 Feb 2009, at 7:44 AM, ADavidhazy wrote:
Herschel,

interesting ... the screens should polarize the same way ... but you can check this out by looking at them through a polarizing filter. But I suspect they all line up the same way. Hopefully the LCD screens will provide a useful amount of
illumination for what you are photographing. andy

Herschel wrote:

Thanks Andy. This is really timely good news. No kidding, I was shooting artwork yesterday afternoon and wishing I had polarized lighting. I'm gonna take 2 LCD monitors and try it out. I hope they polarize the same way!





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