Both these enhanced methods are supposed to improve convergence allowing one to get away with fewer cycles of deconvolution. Once you have chosen an appropriate CTF and selected a deconvolution method, there are a bunch of parameters that need to be set. This is how many cycles of deconvolution to carry out. Most of the improvement happens in the first few cycles, after that the improvement is more gradual. As a result, there is not much point in doing more than 20 cycles.
Anecdotal reports suggest that doing extremely large numbers of cycles is actually detrimental.
For each wavelength, you can specify a background value that is subtracted from each point in the input data before deconvolution is done. Every five cycles the guess is smoothed by a low pass filter to prevent noise from blowing up and dominating the solution. This parameter sets the steepness of the low pass filter cutoff. The default value is recommended. The second parameter, y , controls the amount of smoothing in the Wiener filter when an enhanced method is used.