For light weight you won't be able to beat this. http://www.bdimitrov.de/kmp/lenses/zooms/long/K400-600f8-12.html
B&H photo until recently was selling them for a couple grand. William Robb wrote: > ----- Original Message ----- > From: "Patrick Genovese" > Subject: Long telezoom --- What to choose ? > > > >> c) sigma 50-500 ... this is the cheapest option but i have no idea how >> good this lens is. anf th f6.3 aperture at the long end puts me off a >> bit... Does any one know what the max aperture is at 400mm ? >> > > A friend of mine had this one. He got rid of it because of the size and > weight. It is rather large. At 500mm, it's going to be as close to f/6.3 as > matters. > Apparently it is a fairly decent lens, but it is a pig to haul around. > > William Robb > > > -- Entropy Seminar: The results of a five yeer studee ntu the sekend lw uf thurmodynamiks aand itz inevibl fxt hon shewb rt nslpn raq liot. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net

