> If I'm not mistaken (and I may be) the Vivitar Series 1 3.8 24-48 > constant aperture is the older of the two Series 1 that you > mention, and it is also the sharper of the two. The other one is > not constant aperture, I think it's 3.5-4.0, or something like > that. It's not as good as the older one.
> On the down side, the older, constant aperture one is big and > heavy. I have it, and love it, though. I've not used the Pentax > M 24-35, so I can't compare the two, but I can heartily endorse > the Series 1 3.8 24-48; it's a wonderful lens (if you can get > over the size and weight). > If I'm wrong about the info in the first paragraph, someone can > let me know. Well, I think you're correct about the Vivitar Series 1 24-48/3.8, Paul - I believe it's the "original" VS1 wide-angle zoom, and it is a very nice lens. On the other hand, I think that the other Vivitar lens might actually be a Vivitar (non-VS1) 28-50/3.5, or something like that, but I don't really know anything about it (so I certainly can't say which is sharper - <g>). The VS1 24-48/3.8 is the "widest" zoom I've ever used myself. (The "widest" Pentax zoom I've used is the A 28-135/4.) Fred
