Quantifoil hole sizes off?

[D. Prabha Dias, PhD]

Hello all-
  We've found that recent batches of Quantifoil grids have hole sizes 
that are significantly larger than the specifications.  We're using 
200 mesh Cu/Rh grids with either R2/2 foil or R1.2/1.3 foil, 
carbon-coated at the factory.  The most recent batch of R2/2 appears 
to have holes that are approximately 2.7-2.8 microns in size, while 
the R1.2/1.3 foil appear to actually have ~1.9 - 2.2 micron holes. 
Has anyone else had similar experiences?  Thank you for your time & 
attention.

-Prabha

-- 
D. Prabha Dias, Ph.D.
E.M. Scientist, Jensen Lab
Division of Biology
California Institute of Technology
M/C 114-96
1200 East California Blvd.
Pasadena, CA 91125

phone: (626)395-8829
fax: (626)395-5730
email: prabha at caltech.edu