In the long telephoto range, the module system produces extraordinarily clear pictures with high contrast and accuracy in detail rendition and color reproduction. And because even the smallest mechanical weaknesses can significantly reduce the performance, especially in this range of focal lengths, the Leica module system is fabricated and assembled with extremely tight tolerances. Nature and animal photographers in particular, who use several focal lengths in this range, will value this system: Perhaps because they can save space with the combination of one lens head with two or three focusing modules, and/or because the smooth and easy focusing effectively supports precise settings in which the subject “springs into focus”.