Interesting Keith but, only parts sinking in at this stage. I have changed my camera to Raw +L, I then just shop a general image of something near me to try see what is happening and try understand it more. Checking my view finder in the camera I am presented with the image just taken, pulling up the file details it tells me it is a Raw +L file. So far so good. So I removed the card and plugged into the laptop, I could see 2 files, a name.cr2 file and a name.jpg file. Looking at properties of the files I see the *.cr2 is 23.1mb and the *.jpg is 5.84mb, I can see straight away the massive difference on file size and memory card space they take up! I then opened Canon Digital Photo Professional 4, again I can see the 2 files and the setting the files were taken at, not aware of the Raw format, other than having seen the file format name, and many others, I have always used JPG files and if I wanted better images I would use TIFF files. Having got this far, I decided to go a little further and downloaded RawTherapee 5.3 FREE software for *.Raw files. Now I can see 'some' of the benefits but, need to back off a little for a while I think, I need to get back to fully understanding the photographic triangle and get that clearly fixed in my brain. There is so much to learn and the grey matter in the brain doesn't take things in as fast as they used to, but thanks for the information, suggestions and help.