I think the comment of "if it didn't make you squint" is probably a good guideline to use. I'd also say that it's probably not a good idea to do this for too long.
Thinking about it, if you have a camera with "live view" i.e. all compacts and some of the newer dSLRs, it's probably not a good idea to have it set up on a tripod with the sun shining directly onto the sensor for any great length of time.
Duncan
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