IM-HO, the last thing you need on a 4x5 camera is a huge 300mm f/5.6 Plasmat with more image circle than you could possibly use. They're in #3 shutters, require huge filters and weigh more than some field cameras. They were really designed for use on 8x10 cameras.
For 4x5, smaller tessars like the 300mm Nikkor M or one of the smaller "super Plasmats" like the G-Clarons or Fuji A or C series are much more practical, even though they have a smaller maximum aperture (f/9 usually).
Heck, a 210mm f/5.6 Plasmat is too large for my tastes. Coverage is not an issue with 4x5 and lenses longer than 200mm or so in just about any design, unless you use extreme movements. So, unless you like bulky lenses that take huge filters, look for more compact designs than the f/5.6 Plasmats. Again, the G-Clarons and the Fujinon A lenses in the 240mm range are really compact and a pleasure to work with (and carry), as are the Fujinon A 180mm, the G-Claron 200mm and 210mm and the Nikkor M 200mm (if you can find one!). I really like my vintage Ektar 203mm f/7.7.
The shorter focal lengths are where you need to be careful of image circle size if you use lots of movements. 150mm Plasmats are usually adequate, but smaller than that often requires wide-angle designs if you need to use significant amounts of rise, shift or front tilts and swings.
Best,
Doremus
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