You can easily use the Schneider Super Angulon 47mm XL on the Master Technika or Tech V - just mount it on a helical mount. Linhof supplies these (they are, of course, expensive - around $300 last time I checked), but you can get nearly identical ones from hong kong on ebay for around $150. You don't want the wide angle adapter. It's a large clunky device that works fine (I used one for a while) but the adjustment knob will get in the way of trying to use a center filter or polarizing filter.
I've shot with a Tech V and a master technika using a linhof-branded Schneider 58mm XL on a helical mount with both the 3B center filter AND a 95mm B+W polarizing filter and gotten excellent results.
Alain Briot, the famous photographer and photography instructor who's written a bunch on Luminous-Landscape, etc., uses a 47mm XL on his master technika WITHOUT a helical mount for a lot of his spectacular images. I use one because I don't have his level of skill, and it makes life easier.
Re: longest lens, I use a Nikkor 300/9, and I think that is the longest you can safely use if you're interested in doing short range portraiture. You can still shoot a few feet from your object. With a 360 or a 450 (non-telephoto), you'd have to keep things further back because you run out of bellows. (I find that top hat extenders take up too much backpack space, but you'd certainly need one for a 450mm)
cheers,
andrew
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