Godfrey
somewhat colored
Well, I was an exhibiting photographer from 2007 until 2016, when I retired. However, I've continued to use the E-1 occasionally, and recently (within the past 8 months) sold a half a dozen ~15x20 size prints that were made with it.When was that? I mean, when 5mp was the norm, sure people were impressed with a 15x20" but it is a really native 6x8" print at 300dpi. Going up to that size is going to lower that DPI substantially. At the size you are talking about, yes, you'd need that 6 feet in-between you and the print to disguise the low resolution. It could work well for a print with one big subject, but not for prints with many points of interest that require fine details. Despite what people say about viewing distance, in my experience, people look at photos very close in galleries and museums. That said, a 15x20" print from a 20mp camera is not an issue.
People who look at photos to try to pick flaws and be awed by the detail stick their noses right up to a 16x20 print and often carry a magnifying glass. I've never seen *any* of those people buy a print.
People who look at photographs to appreciate and enjoy whatever the aesthetic qualities/message/emotional content might be tend to stand at about the proper viewing distance and enjoy them ... I'd say that nearly all the folks I've seen buy photographs at a gallery or exhibition behave that way.
... And, of course, I use up-rezzing techniques with a 5Mpixel original in order to achieve the correct output pixel density for a large print like that. For the E-1, the print file is 20Mpixels, for the E-M1 it's 32Mpixel. The Leica M10-R/-M and Hasselbad 907x/CFVII 50c require no up-rezzing for this size print, also of course. I learned the techniques from one of the Olympus master photographers back around 2000 or so at a seminar. 🙂
G