Re: [ccp4bb] High Rmerge with thin frames

2010-11-06 Thread Kay Diederichs
Am 20:59, schrieb Harry Powell: ... 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

Re: [ccp4bb] High Rmerge with thin frames

2010-11-06 Thread harry powell
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

Re: [ccp4bb] High Rmerge with thin frames

2010-11-06 Thread Guenter Fritz
Dear Ronnie, we are working with weak diffracting crystals. Many tests (and taking into account Marcus Muellers results) showed that 0.3-0.5 of XDS mosaicity, (very) low dose, and high redundancy give the best results. Our crystals diffract between 7 and 4 A. At low dose I do not check

Re: [ccp4bb] High Rmerge with thin frames

2010-11-06 Thread Sergei Strelkov
Dear All, first of all, I would like to thank the many good people who have responded to my query. Yet another truly interesting discussion on this BB! As a partial summary, two points: 1. Few people suggested that our high Rmerge problem could be caused by experimental troubles like phi angle

Re: [ccp4bb] High Rmerge with thin frames

2010-11-06 Thread Kay Diederichs
Am 20:59, schrieb Sergei Strelkov: ... I still tend to think that the best proof would be in the pudding, i.e. trying to pool thin frames into thicker frames (but I do not have an immediate means of doing this... ) Sergei, try to locate 2pck and 2pck.man which were part of former XDS