Quantifoil R 2/1, UT, 400 Mesh, Copper
QUANTIFOIL R 2/1 with Ultrathin Carbon
Has more open area than R 2/2. It is used when focusing is carried out on the edge of a hole burnt in the ice in a neighboring hole instead of on the foil adjacent to the hole.
Hole Size: 2 µm
Period: 3 µm