Table 2. Achieved focal spot size and Strehl ratio for the Be CRL and phase plate combinations investigated.

Beamline	Energy (keV)	Phase plate	Focus size FWHM (nm)	Strehl ratio†	Transmission
DLS I13-1	8.2	–	69	0.10	0.165
DLS I13-1	8.2	Diamond‡	76	0.70	0.124
PETRA III P06	35.0	–	85	0.15	0.356
PETRA III P06	35.0	Polymer§	95	0.89	0.352

^†Ratio of integrated intensity in central speckle compared to ideal, modeled lens.

^‡See Figs. 5(a) and 5(b) ▸.

^§See Figs. 5(c) and 5(d) ▸.