timbo10ca
5-Mar-2007, 20:26
Hi- could anybody tell me what the 1.4 and the 0.8 on either side of the triangle on the ISO dial are for?
I was planning on sending some film to the View Camera store for testing but I was wondering if I might use the Powerdial without BTZS paper testing. For example, my Ilford MGIV RC documentation rates grades 00 to 3 all at 200. I just finished calibrating my RH Designs exposure meter and got ISO ratings for each paper grade that way. Can I use these numbers, rather than sending in paper to be tested as well? My confusion lies in that the graph on the Powerdial goes from ES 0.8 to 1.6 (ISO of 80 to 160, right?), and the Ilford ISO 200 won't fit on here, or my own calibrated grade 0 Value (which is above 160). Is it assumed you are printing on grades 1 through 3 when using the Powerdial?
Thanks,
Tim
I was planning on sending some film to the View Camera store for testing but I was wondering if I might use the Powerdial without BTZS paper testing. For example, my Ilford MGIV RC documentation rates grades 00 to 3 all at 200. I just finished calibrating my RH Designs exposure meter and got ISO ratings for each paper grade that way. Can I use these numbers, rather than sending in paper to be tested as well? My confusion lies in that the graph on the Powerdial goes from ES 0.8 to 1.6 (ISO of 80 to 160, right?), and the Ilford ISO 200 won't fit on here, or my own calibrated grade 0 Value (which is above 160). Is it assumed you are printing on grades 1 through 3 when using the Powerdial?
Thanks,
Tim