AVS Forum Special Member
Join Date: Aug 2005
Location: Brisbane, Australia
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I think TDK is quite acceptable in Scope because all of the IMAX scenes were framed to match with the rest of the Scope film.
These prisms are small, but do have an optic surface finish and optic coating so should (whilst not perfect) give better results than the "trophies" used in many DIY anamorphic adapters.
CA will always be a problem because of the fact that these prisms are made from just one type of glass.
Astigmatism correction requires either special additional lenses or curved surfaces ground into the prism. If one was to take the time and effort to do that, one might just consider cylindrical lenses a better alternative.
Grid Distortion will always be worse with this type of design.
I love my Constant Image Height system!