I’ve been trying to shoot fish in an aquarium, with my lens up against the side of the tank. Why are most of my images blurred? Kevin Hatfield, via email
Jason says... There are several possible causes. First, it could be a focusing issue. Select a single AF point and align it with the part of the fish you want to be in focus. Use continuous autofocus to track any movement, and fire off a short burst in continuous shooting mode.
Avoid slow shutter speeds as they can result in motion blur (up your ISO setting if necessary). Aim for a speed of 1/125 sec or faster.
Resting a lens against the side of the tank can increase the effect of mirror-bounce, giving rise to blurred images. Ease back a little, but watch out for reflections.
You’ll need a wide aperture to enable a faster shutter speed, so the whole of the fish may not be in focus