I like the 13x19 format. I was putzing around one day trying to find an efficient way to print tests without wasting a lot of paper. Well, it turns out that if cut a sheet of 8.5x11 paper exactly in half - ie. 5.5x8.5 - you get a format that is almost the same as 13x19. The ratio for 13x19 is .6842.... The ratio for 5.5x8.5 is .6072.... It works really well for me - very little crop adjustment required.
Also - I had some two sided Premium Presentation Matt paper - I accidentally left off the Ultra when I ordered it. That meant I could get 4 test prints out of one sheet of paper:-)
Food for thought. If you use 13X19 paper and print your photo with a 1/2 " margin, your print's actual size is 12"x 18". a standard 2:3 ratio
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