Further to my message above, what makes the 355 G-Claron so special in regards to its ability to cover 7 x 17? It is a smaller focal length lens and has a smaller native image circle at f-22 when compared to the Fuji above. Is it the design of the G-Claron (non-plasmat?) that allows it to cast a large image circle when stopped down compared to a plasmat lens? Why no concerns of mechanical vignetting with the G-Claron? Thanks for your clarification on this.