https://www.markertek.com/product/dscl-fh-sw/dsc-labs-sw36-fh-fiddleheads-test-chart-standard-21-3-x-13-inches
DSC Labs SW36-FH FiddleHeads Test Chart - Standard 21.3 x 13 Inches
The DSC Labs FH-SW FiddleHeads is a standard size precise focus test chart.
dsc labsfhfiddleheadstestchart