Lens out of focus

Used my t1i today and surprised it won't take pics. I noticed that my lens, no matter what I do is out of focused. Then I connected my bower fisheye tried it and the camera worked. After I removed it, the camera started working again and the out of focus issue was resolved! What was that all about. Now I'm working on the macro feature...pure amateur here.

I don't shoot video with my DSLRs, so this is just a guess...
You mention you were shooting video... Can the T1i even auto focus during video? I thought it was manual focus only, in video mode.
When you put the fisheye lens on, that has such deep depth of field that everything near to far is in focus anyway, I suspect. When you switch back to the 18-55mm, at some settings depth of field is fairly shallow, so anything out of focus is more obvious than with the fisheye.
Alan Myers
San Jose, Calif., USA
"Walk softly and carry a big lens."
GEAR: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories
FLICKR & PRINTROOM 

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