Consider a simple light blue filter to mimic the spectrum sensitivity of films from 1900 to 1920.
My experience is that wet plate and soft focus lenses don't play well together. Each has it's own signature, and the heavy, sharp artifacts and somber mood of collodion don't compliment the airiness and glow from a soft lens.
For reference, Ernest Purdum's article on the forum's home page is a good start:
http://www.largeformatphotography.info/soft-focus.html
If you haven't found it yet, Russ Young (a member here) did a wonderful doctoral thesis on soft lenses:
http://research-repository.st-andrew...ndle/10023/505
Jim Galli's website features many examples, comparisons, and insights on classic soft lenses:
http://tonopahpictures.0catch.com/
...and there must be hundreds of threads on soft lenses here on the forum. Plenty to keep you busy!
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