Stuart, you need to step away from the tool kit. Don't take apart your camera...those can be tricky.

I upgraded from the nifty and have the 50mm 1.4 (canon version) and use it all of the time. It is not expensive and does the job you need it to. I actually enjoy the way it looks from 1.4 to 1.8. Isn't the razor sharp photo you get from the Sigma Art, but it works great IMO. You just have to be careful with it. Don't bounce it around or hit the extended part of the lens when focusing since you can break the focus mechanism very easily. I purchased the hood for mine and never take it off for this reason.