I have a question regarding "pulling" my film (Ilford Delta 100 - rated at 80 ISO) during what is a very contrasty time of day. I have been testing my medium format equipment out on a particular cityscape, returning time and again to alter either one or two variables, either my lens, filter, or film, in order to see the effects in the final print without becoming confused as to what these adjustments are actually doing. The subject is a bridge, and I always set up in the same spot just as the sun rises. I've settled upon using Ilford's Delta 100, with an orange filter to reduce haze effects, tripod, sunshade, and cable release. I also use a hand-held incident light meter, although a spot meter is probably in my future. As expected, the prints always need significant dodging in order to bring out details under the bridge. I am content to do this rather than use a very low contrast filter while printing because the structural details above the bridge would go too flat otherwise.(posted 8362 days ago)My question is this: If I wanted to "pull" the film one f-stop(N-1), would I set the light meter to 40 ISO (half of my EI of 80), and then reduce the film development time approximately 20%? I use ID-11 at 1:3 dilution, and instead of 20 minutes development (under the EI 100 column), I assume this would become 16 minutes instead? Would N-2 require a light meter setting of 20 ISO and 40% development time reduction? I realize that I should be using a spot meter and measuring the overall scene brightness before deciding to reduce contrast in this way, but I'd like to see the effects anyway.
Thanks in advance for your help-- I'm getting a bit lost in reading "The Negative."