Archived posting to the Leica Users Group, 2011/05/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Henning can confirm, but it looks from the transmission spectra that 89B is the closest. And if they are proper Wratten filters they are gelatin mounted on glass. Very optically regular, but not coated and subject to scratching. Marty On Sat, May 21, 2011 at 11:54 PM, Frank Filippone <red735i at earthlink.net>wrote: > Minutiae? > > What is the number of the Wratten Filter that is the same as the 720nm > filter made by B+W ( 092) ? > > 89B > > 89B Filters are made for square filter holders ( made from plastic?).... > > I note that there is a supply of 720nm filters in E39 size made by B+W. > Price is around $60. The only ones I have found. > > Frank Filippone > Red735i at earthlink.net > > > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >