I assume you are referring to the Sigma EX series with the constant f4 aperture. This is an excellent lens, I have one and am very pleased with it; it has also received very good reviews in several photo mag's, including Pop Photo.
It is a substantial piece of glass if you are used to consumer grade lenses in this focal length with variable apertures. However, if you can handle the price and the weight, this is a high quality lens both optically and mechanically, and one of the very few with this focal length in a pro grade lens. Cheers, Mike. Christien Bunting wrote: >Hi all. > >This is my first post here. > >I'm very much interested in getting the Sigma 100-300 f/4 or a lens of this >type. As for now I have a Pentax MZM. The MZM does wonders for a little guy. > >Has anyone had experience with Sigma Lens on the MZ-M. Especially the new AF >lens of constant aperture. > >Hopefully later on I'll move up to the upcomming MZ-6 or even the MZ-S. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
