Hi All
Both Martin and Kay ( in a later message) have misinterpreted what I
wrote - what I meant was that it seems normal in using XDS with
Pilatus data, not the normal thing to do with data from other detectors.
I had found a number of scripts on the web that deal specifically
with processing Pilatus data with XDS that seemed to use
"PATCH_SHUTTER_PROBLEM=TRUE" - what I didn't notice was that the
commands had all been commented out, and that "FALSE", the default,
was in operation.
So, in either case I was wrong. Apologies to Kay and Wolfgang, and
all who write and use scripts for processing Pilatus data with XDS.
On 5 Nov 2010, at 18:33, Martin Hallberg wrote:
> 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
>
>
>
>
>
Harry
--
Dr Harry Powell,
MRC Laboratory of Molecular Biology,
Hills Road,
Cambridge,
CB2 0QH
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