I'll chime in with my reasoning. I started with 8x20 simply because years ago I aquired a old 8x20 holder and built a crude homemade camera for this holder. Later, I bought a more holders (S&S) and eventually a beautiful 8x20 Korona. So here I am ... an 8x20 devotee. I like the fact that the 20" dimension is about as ULF as you can go. However, if I was starting from scratch I might seriously consider 7x17 if only for the fact that many more lenses fully cover 7x17/11x14 than 8x20.
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