Minus blue (Waretten #12 or equivalent) gel or polyester filter (not glass)
That should have said Wratten#12 or equivalent, of course.
I am prototyping an optical device in a non-photographic context, and need one or two of these. So if you have one of these you aren't likely to use again, please let me make good use of it. I am in the UK, but these are easy to post, so anywhere in the world.
I'd also like to try the tricolor filters, but apreciate these are less common.
Last edited by Jonathan R; 06-20-2013 at 09:54 AM. Click to view previous post history.