I own a barrel 59cm Zeiss Apo Planar and it's a keeper. I once showed it to optical expert Ron Wisner and he said to me "Worth Every Single Penny". You are lucky to find such a great lens, they are not common
A more common choice, yet superbly corrected, would be a 760/11 Apo Nikkor barrel lens. I assume it would cover 16X20, since the 360 version easily covers 8X10 with movements stopped down. Since most of these barrel lenses were designed for the printing industry to begin with, their official published image circle specs tend to be way more conservative than what applies to general photographic applications.
There are a number of 210mm lenses on ebay right now.
The Norma is an infinitely extendable "Construction Unit" design
The Zeiss Apo-Planar 80cm is a process lens.
80cm is 32". A process camera for that lens will probably have 2.4m/8ft or more of bellows draw. On a view camera you are going to need ~120cm/48"/4ft of bellows unless you are confining yourself to taking pictures of distant mountains.
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