Patrick Genovese wrote: > I'm looking for a long tele zoom and i've whittled the choices down to > the following options: > > I need to cover the focal length range from around 100mm to 400mm > (before crop factor being applied) so here are the shortlist of > options: > > a) Sigma 70-200 f/2.8 + 1.4x tc (98-280f/4) or 2x TC = (140-400 f5.6) > With option I would think that the optical performance with the 2x > converter may not be stellar... so i'm not too happy with that option. > But OTOH i get f 2.8 between 70-200mm
I don't think this is a viable option. If you want long, you should look longer than 200mm without a TC. > > b) sigma 100-300 f/4 + 1.4x convertor (140-420 f/5.6) I guess the > 1.4x converter is not too much of a compromise. I've heard good things about this lens. I liked my 300/4 sigma. The matched Sigma EX1.4x TC is very good. > > 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 ? Not sure what the max aperture is at 400 but I do know that it is a bit soft wide open and not super great at 500mm. It is a better choice than the 170-500mm which is cheaper. -- Christian http://photography.skofteland.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
