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I want to analyze my most and least used FL's.. Focal Length is in the EXIF information so I would like to create a filter with two criterion... First by lens, then by the actual focal length if the two are different. Any suggestions?
While the lens used is a standard filter criteria in LR, focal length is not. All I know of is Jeffrey Friedls Focal-length Sort plugin, you might want to have a look at it.
Beat is right that focal length is not a standard filter but you can do it by negating those fields likely to have the same value. The following picks up focal length of 4''mm but is really only useful for occasional use rather than for multiple focal length values.