I just want to confirm what I am seeing is real.... not some error in my process. Paper in question is Ilford MGIV FB Glossy in 8x10 cut and 11x14 cut. These were purchased at the same time from the same vendor. (no way to tell if they came from the same master roll) I have a negative which prints exactly the way I want on 8 x 10 paper with 1/4" borders using #1 1/2 filter, f/8, and 21 seconds. When I wanted to print this on 11 x 14 with the same border, I calculated the ratio of surface area and used that multiplier for 21 seconds, then came up with computed figure of 42 seconds exposure. Comparing the results, the larger version has shadow area is about 1/6EV darker. Is it correct that this method will give me fairly accurate figure but fine tuning is still required?