Re which CF for which lens, see
http://www.galerie-photo.com/center-...at-lenses.html
You may have to buy used. FWIW, I have four, all bought used. Much less expensive than new.
Depending on how much you move the lens off center (vertically, horizontally) you may not need a CF. There's a widely accepted rule of thumb that lenses no shorter than 90 mm (corners down 1.5 stops from the center with no decentering movements) can be used safely without a CF. I suggest that you buy a lens and try it before you buy a CF to fit it.
When you shop for lenses, don't neglect Fujinon and Nikon 90 mm lenses. My article (link above) suggests which CFs to use with them.
Lastly, since you're a new arrival here you may not be aware of this site's resources. In particular, the list of links linked to in the first post in this
https://www.largeformatphotography.i...mainly)-lenses discussion.
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