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"Objective" testing of filters
M Gavin has tested the performance of various filters using a spectroscope.
Shows EXACTLY what is happening and which wavelengths are being transmitted/ blocked well worht looking at. When I get some time (!!) I'll do the same for the filters I have.
//home.freeuk.com/m.gavin/grism.htm
If this link doesn't get you there, go to his home page and look at the LH list near the bottom.
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