ian_anderson10

<p>Not to compare this to those really nice lenses being talked about, but there is also the newer Sigma 70-300mm f/4-5.6 DG OS for $400 that can also be used on full frames. It's good for about 2 to 3 stops, not the 4 it advertises at. I bought it and I got some really sharp shots at 300mm. Unfortunately I had to send my new T1i in for repair because non of my lenses including this lens were getting a sharp focus very often (without manual or live view), but they all worked great on my XTi.<br>

Anyway, thought I would mention it.</p>

<p>It looks like this thread is long over and I don't know if anyone is reading it any longer. I installed Windows 7 and the thumbnails in windows explorer would show the CR2 from the Canon Xti. After I installed DPP, Zoom Browser and everything else that comes with Canon's cameras, it quit working. I currently have the T1i, but Windows Explorer's thumbnails doesn't work with it's CR2s either.<br>

I have seen other threads with people complaining about the same thing, but have never seen an answer as to how to fix it. It's frustrating that it was working and Canon's software broke it.<br>

I have all the other programs for viewing the CR2s, Photoshop CS4, Picasa etc, but there are so many times where I want to do maintenance with folders/names etc using Windows Explorer, not DPP or anything else, and it's difficult because I can't see anything about the picture.<br>

There are a lot of reasons for using Windows Explorer for CR2s, another being to drag them to a CD to burn. For now I get around it with the other programs though.</p>