Open a sample image containing beads with a known diameter and run the PSF Extractor to generate the point spread function(s) from the image. Save the extracted PSF file and load it using the Import PSF function inside the Deconvolution dialog (see Import PFS... in 3D Deconvolution). For more information about capturing beads, please see Determining the Point Spread Function (PSF).
Channel
Image channel from which the PSF will be extracted.
Bead diameter
Physical diameter of the beads used in your sample image.
Layers
Number of layers in which the PSF will be detected. The more layers you define the more point spread functions will be extracted and shown in a multi-point image.
Max. number of best beads
Start with the default value. If the result is not satisfying (e.g. when the sample contains a lot of noise particles with a similar size as the beads) try to lower the value.