We review a lot of programs every day here at Softonic and we tend to take a lot of screenshots. The tools we use to do this need to be easy to launch and offer a good set of tools.
Copernicus is a solid screen capture tool which allows you to capture parts or your whole screen. You can also record small videos. Copernicus lets you set the frame rate and decide whether to rely on memory or hard drive.
I like how Copernicus includes a preview interface for batch handling your different screen grabs. When saving you'll notice you can adjust the quality of the image, however you won't be able to change the format from JPG.
I didn't really like how Copernicus worked with F keys, which I don't find the most comfortable to work with on a Mac. However other users might find them very handy for controlling the program.
May not work properly on OS X 10.6.
Precise capture tool
Capture short movies
Can only save in one format
Use of F keys
Doesn't record audio
Copernicus doesn't just take screenshots, it's a virtual photo gallery too. Take as many pictures as you like, then save them one at a time or all at once.
"can not record movies"
will NOT allow me to record movies in full screen, it only records in region, no way to set it to full screen movie recording.