Thanks for the help! I think because of not much time to react, I was making sure I was getting the shutter speed fast enough to stop the canoe. Maybe it didn't need to be 1/400?
it's all relevant. 1/400th only means something when all else is known..
You may have needed 1/400th just to stop camera shake and everything else needs to fall into place because of that.. so then, what kind of shot can you take if you need the shutter speed to keep the image sharp? Well, then you're definitely needing to open up the aperture or increasing the ISO , thus losing sharpness.. Give and take...
