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Actually, it will help a lot.
Transmission will be lower (as Ian calculated) , but rejection of (some) undesired wavelengths will be vastly improved.
For example, if transmission of undesired wavelength is 1% (0.01x), if you stack two filters you will have 0.0001x (0.1%).
The problem may be additional reflections (from filter surfaces) and of course, price/performance ratio... because, undesired wavelengths are already sufficiently reduced....
Last edited by bojan; 18-11-2008 at 09:45 AM.
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