kristen_williamson

<p>so the Tamron 17-50mm f/2.8: are you saying that will that give me a maximum aperture of 2.8 at any zoom length?<br>

thanks!</p>

 

<p>oh! i did not know that it had to be at 18mm. i bet that is what my problem is. I have invested in about 6 good photography books and am in the process of reading them all. The amount of info is a bit overwhelming but so so interesting. i will check out the tutorials, thanks so much for your help!</p>

<p>I just bought a canon 50D before Christmas so I'm very new to this, its my first DSLR camera. It came with a kit lens and I also bought this Sigma lens to go with it. <br>

The question I have, on the lens it says F/2.8 but my camera won't take it lower than F/3.2. Is there something I have to do besides putting the lens on the camera if it isn't a canon lens, or should the camera already know the range? I've tried changing it in all of the creative modes and none will go below f/3.2.<br>

any ideas? hopefully the answer is so obvious as to make me feel silly !<br>

thanks in advance :),<br>

kristen</p>