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I have been learning how to test for back and front focusing in SLRs. I have decided to do this as well as checking for dust on the sensor when selling a SLR. I also upgrade the cameras firm ware. For those of you using a DSLR you will understand how important this can be. Checking for dust is easy enough, cleaning it if there is some a little harder. After finding two new out of the box SLR's with dust I think this is a important thing to do. Checking focus required a good camera stand with precise alignment to feel confident in the test results. I had my friend John the machinist build the stand you see in the photo and it works wonderfull. I have more to learn but I have got past the feeling I have opened a can of worms and this will be a usefull tool. Bill