I have a Digital Rebel Xti (400d) body. Unfortunately this means I don't have the ability to adjust the camera to compensate for the back focusing. I think the Live View mode of the 40d or 50d would be helpful if I clicked over to manual focus. I could then zoom in on the preview window and really nail focus that way.
Also, because I have the Xti, the only 'precise' AF point is the center. I've tried the other 8 AF points, but I'm not having much luck there either. I used to be a fan of focus and recompose. Now I compose, choose my AF point, focus and then capture.
These two features are partly why I mentioned that it may be the camera (as opposed to me or the lens). I'm just more inclined to believe it's me making mistakes.
0.05 feet is a tad smaller than 5/8 of an inch. I agree that's thin, but it still seems doable. If I tell the camera AF to focus on an eye, then it should be able to nail it (and eyelashes) and even remain in focus if I cause a small amount of movement when I squeeze the shutter.
I always considered the trifecta of primes to be the 35, 50 and 85. The 135 being considered in that group is new to me, especially with an APS-C body. With the 50, it's like I'm shooting an 85.
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