On another note, the sensor on my camera has become quite dirty. It has probably been picking up dirt over time - it's one of the risks when you start swapping out lenses on your DSLR, but I didn't really notice it until I dusted off the light box and took a few shots. I can see much of the dust when I lock up the lens, and I've tried dislodging it with a few puffs from the lens cleaning bulb I have for the camera. It got rid of the tiny hair that was clinging to the sensor, but the rest seems to be hanging on quite tenaciously.
I keep looking at the can of compressed air on my desk, but that has bad idea written all over it.
I suppose it's time to take it back to the shop and see if they can do something for me. If it was just a speck or two I would just use a reference photo to map out the specks, but the sensor is really quite dusty. I cropped and edited the specks out of this shot, but I know they're there and it causes me much annoyance.