BREXIT UPDATE: There are delays with all freight companies and customs agencies in the UK and many European countries at this time. Please be assured that we are working with them to deliver all orders as quickly as possible. We are temporarily unable to guarantee next day service.
Interference filters will function with either side facing the source. We recommend, however, orienting the “mirror-like” side toward the source to minimize any thermal effects. If the source overfills the actual filter area, beam vignetting may be necessary.
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