Quote Originally Posted by Donald Miller
I spoke with Jensen sometime ago in regard to UV transmission of the regular Durst condensors and he did say that they were largely transparent to UVA with a loss of perhaps 1/3 stop. This may not address their performance when used with a point light source however.
The opacity of a set of condensers to a given wavelength is a fixed value as it is determined by choice of material (including coatings) and thickness alone. It's the color temperature of the light source which may be the variable to watch out for here. If it is a small halogen lamp it usually will burn at higher temperature and put out more UV than an opal lamp.