Mirror lock-up and bracketed exsposures on 40D

I am getting into HDR and trying to take bracketed shots. However when I upload them onto the computer they are ever so slightly out of alignment give soft images. I have made sure the tripod is tight etc..

I have tried to use mirror lock-up but it does not work for bracketed shots. It does work for single shots. I have a 40D can anyone offer any words of wisdom?

Thanks

It's time to use a remote/5 second delay timer.

Sometimes all it takes to knock your shots out of alignment is a small breeze. I know you said you've tightened your tripod - but just make sure your camera strap (if you've got one) is not flapping against the camera/tripod in the wind. I find the 10-second timer really useful on the 40D (given that I don't have a remote timer). I don't use mirror lock-up on my shots - I just shoot 3 bracketed shots as normal, and this seems to work okay.

What software do you use? Sometimes this can make a difference. I use Photomatix Pro. Also, I find that I get better (sharper) images in Photomatix Pro when I work with TIFF files.

If you use Live View when on a tripod the mirror is already locked up. Put it in x10 magnified view and any movement becomes very visible. In addition I use a cheap wireless remote release, about $20 on Ebay, to avoid any contact with the camera. And to increase the stability of your tripod hang a weight from it.

Board member Team Speed was selling wireless remotes at one time. I don't know if he still does, but you could PM him.

As mentioned... go into Liveview... that locks the mirror up. Just one button to press. Also use a wireless remote. Try looking through the viewfinder and trip the shutter manually....you'll see all kinds of shake.

You can use SW like Dynamic HDR that let's you manually align the stack too.

Thanks for all your advise, I will persevere with your recommendations