So I used "M" mode on my XTi to take pictures in a forest with a good amount of light coming in but...well its a forest...of some fast riders (mountain bikes, air borne). Anyways, I had the Canon 50mm f/1.8 lens on since its faster then my tamron, and I set the shutter speed to 1/350 and ISO to 400 (probly shoulda been 800 after reviewing pics on my comp). Down to the point. Why is it "M" mode shoots at constant 2.8? I tried to up it to 1.8 by pressing the appature button on my camera, but it doesnt get to better apature, only worse...(numbers get higher). Is their anyway to set the Apature to 1.8 AND my shutter speed to 1/350 (if not higher) ?
Maybe a mode that I dont know well...? I only know "P", "M", and "A-Dep" well...
Thanks.