Can you transfer photos from the Panasonic dmc sz-20 camera to an IMac with os 10.7.4. Thanks

This article tells you which RAW formats are supported in Lion. Even if you don't find your camera on there, if the camera has a media card, you should be able to read TIFF, JPEG, and PNG images at minimum through a media card reader that is Mac comaptible. Most cameras these days support either SD or Compact Flash. SD only slots are available on the most recent iMacs, Mac Minis, and MacBook Pros as a built-in slot. For all other Macs and media cards many Firewire and USB card readers are avaiable that are Mac compatible, and multifunction printers will allow you to read most card formats. Check your camera's owners manual what cards are accepted.