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. Author manuscript; available in PMC: 2013 Mar 1.
Published in final edited form as: J Struct Biol. 2012 Jan 21;177(3):589–601. doi: 10.1016/j.jsb.2012.01.008

Table 1.

Summary of observed SNR values of carbon film images at 10,800× detector magnification across a defocus range of 2.2 – 5.5 µm with images recorded at 15, 20, or 25 fps on a JEM-3200FSC microscope operated at 300 kV.

Spatial Frequency Mean Minimum Maximum
1/2 Nyquist 2.48 2.08 3.13
2/3 Nyquist 0.90 0.76 1.01
Nyquist 0.14 0.08 0.27