Rob. the Topaz, IIRC, uses a zoom lens. It was, when in production, sort of Heidelberg's 'entry level' high end scaner usingmuch of the technology of their top-of-the line F4200. To give you an idea of performance the F4200, in a comparative test conducted by Seybold of most of the then current high end scanners using a 4x5 chrome the F4200 rank 4th out of 14 scanners tested. The Heidelberg 2400 ranked near the bottom and the Topaz, had it been tested likely would ahve come out better than the 2400 and not as good as the 4200 ... a long winded way of saying that you will get excellent performance from this machine as all the scanners that were tested are in a different universe than the prosumer scanners.