Talk:Reciprocity (photography)

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[edit] Fast Shutter Speeds

Reciprocity failure also exists at the other end of the spectrum -- when shutter speeds are faster than 1/1000 of a second. In that case the aperature has to be opened wider to compensate for the short exposure time.

Reciprocity failure is supposedly useful in astrophotography. Can someone elucidate?

[edit] EV=5 Example

Shouldn't the exposure time be 4.5 seconds in the example? I realize that it is nice to round off, but in this case, the round-off error is almost 10% of the exposure time. I'll change it in a few days, unless there are objections. (neffk <neffk ta ieee tod org> 9 April 2006)