You asked
What are the alternatives to the leica vario elmar tl 18 56mm f 3 5 5 6 asph?
The only other lens on the site that's a close relative of the 18-56mm is the Leica Super-Vario-Elmar-TL 11-23mm f/3.5-4.5 ASPH. It's a wide-angle zoom for APS-C, about 17-35mm equivalent, so it's not a straight swap. Pick it if you want wider frames for landscapes, interiors or street shots where you're close to your subject. You'll lose the reach of the 18-56mm at the long end.
I don't have other standard zooms from other makers on the site, so I can't recommend alternatives beyond that. For what to look for, the Lenses guide explains aperture and why cheaper zooms get darker as you zoom in. The L-Mount page is a good place to see what else fits your camera.
Written by Claude from this site's pages.