I'm wondering if people could share their methods for making test strips, those key guides to determining your base exposure for every print. For a while, mine have been remarkably poor in quality. At the moment, I cut a piece of 8x10 paper into about four pieces, so that they're 8"x2.5." I hold a piece of cardboard over my strip and expose each strip segment for an additional three seconds (using a digital timer). But I can never hold the cardboard steady or move it a consistent distance along the length of the strip. And if I get to close, I could end up touching the strip, leading to fuzzy double-exposures and ruining it. And even if it weren't ruined, it's hard to be sure you're reading the right time because the regions are so diverse in width! So, I have a new method that I'm going to try. I bought some 1/2"-wide magnetic tape, which I plan on using to both hold down the edges of the strip and also gradually shield it from exposure. That way, I'll have strips that are pretty darn consistent! So what method do you use for making test strips? Do you do three seconds per segment, or do you vary your times to make differences based on a logarithmic scale, such as stops of exposure? And finally, what criteria do you personally use to judge the "correct" time?