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Dear All, If anyone could give me a recommendation and manufacturers name for a commercial variable optical attenuator, I would be very grateful. I am looking for a cheap commercial optical attenuator for use in the visible (Ar-ion laser, 488 nm or 512 nm, 2W cw). Thank you for your time, Best regards.... Iain McNab URL: http://www.utoronto.ca/jpolanyi URL: http://www.phys.ncl.ac.uk/research/atomic/irm/mcnabgroup.htm ********************************************************************** Iain R. McNab Department of Chemistry University of Toronto 80 St. George Street Toronto, Ontario, M5S 3H6 Canada Tel. No.: (416) 978-3625 Fax No.: (416) 978-7580 E-mail: [log in to unmask] **********************************************************************