They are the same mike, with different capsules. The 4053 is a hypercardioid,
and the 4051 is the cardioid. The 4049 is the omni version. You can, in
fact, buy one mike and get the various different capsules as options so
you can get multiple patterns.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."