This is taken from Aura Lens's site this morning:
Quote:
5/12/2016
All sales of soft and borosilicate glass filters have temporarily been suspended due to an industry-wide shortage of sodium flare filter glass. Aura Visual Concepts is working hard to relieve this shortage, and we ask for your patience while we sort out the problem and restore our products to our line.
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I don't have any more information than that. I know Mike said prices from his suppliers had been going up drastically and that his prices would probably be going up soon.
To find out more, I would monitor Mike's site for the latest updates:
www.auralens.net