----------------------------Original message---------------------------- Please forgive the empty mail message. Wrong device setting on the Mac I'm using. Thanks So here's what I was going to ask. A while back I completed research project involving the use of inexpensive theatre gels as filters for the camera system I was using. (the title was "Aerial Photography of Otsego Lake Testing Film/Filter Combinations in the Sensing of Submergent vs. Emergent Freshwater Aquatic Vegetation") I only tested 6 gels due to the size of the grant I received. For those 6 gels, I sat in front of a spectrometer for about a half an hour getting transmission spectra from 300nm to 840nm. (840 was the max on the machine I was using, I would have really liked to get the readings from up to 1000nm.) Since the companies that produce the theatre gels don't require the transmission spectra to be available to the general public, I was going to sit down in front of the spectrometer again and test all the samples they had sent me. Before I spend a day hunched over a spectrometer, has anybody done anything like this and if so was it published. Thanks Tim VanVranken Graduating Geography Major (Aug. '93) GIS/Cartography/Remote Sensing SUNY Oneonta Oneonta, NY 13820 [log in to unmask]