Hi Harry, On Nov 5, 2010, at 5:45 PM, Harry Powell wrote: > > I think there may be issues with collecting data too finely with a Pilatus, > even in shutterless mode. I don't know where the problems arise (can't be > shutter/rotation axis synchronisation), but it seems to be the normal thing > in XDS (which should have no problems with fine phi-slicing) to use the > "PATCH_SHUTTER_PROBLEM=TRUE" that Martin Hallberg suggested, which looks a > bit like a fudge to me (but I expect Kay to correct me on that!).
It is not the normal thing in XDS but it is perhaps a relatively common solution to shutter/spindle synchronisation problems discovered afterwards (always process directly at the beam line!). The default in XDS is indeed PATCH_SHUTTER_PROBLEM=FALSE Compensating like this is of course not the best (go and recollect!) but still way better than unusable data in the meantime. In the case Sergei originally described it would at least indicate what the problem may be. Sergei did not say which detector was used for the data collection so we don't know if it was a Pilatus or a CCD. Maybe Sergei can fill us in on the details? BTW, any views in the community on crystal lifetime with continuous data collection like on the Pilatus (or AXIOM) versus letting the crystal rest/cool/die(?) a second between frames on a CCD? Cheers, Martin
