I owned at one time a Wollensak Raptar 13/20/25 convertible and the combined elements did not cover 11X14". Almost, but there was some vignetting on the corners. I don't remember about the single elements but generally the coverage of the single elements is not more than that of the combined elements. You have a longer focal length but the actual angle of coverage is much less.
Originally Posted by jnanian
My understanding was that the Raptar is the coated version of the older Wollensak triple convertible.