Archived posting to the Leica Users Group, 1999/10/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Guy Bennett wrote in part : <<<a quick question regarding printing filters: is it possible to extrapolate print exposure times when changing from one filter to another? obviously (i hope), i'm talking about using graded filters with multigrade paper. for the record, i use ilford multigrade iv fb paper with ilford filters. if my test print, made with a no. 2 filter, is too contrasty at, say, 20 seconds, can i calculate mentally how long an exposure i will have to give the same image printed with a no. 1 or 1/2 filter, or will this be a purely empirical operation?>>>> Guy, According to Ilford instructions (french edition) filters from 00 to 3 1/2 have the same density such the same time can be set. Density of filters 4, 4 1/2 and 5 are twice the previous so exposure must be doubled. Of course modification of contrast can bring you to slighty adapt the exposure. Hope it helps Bernard bernard.degaute@village.uunet.be