Digital camera files

[Kevin Lock]

I have a Jenoptik digital camera of 1.3 megapixels. When I save 
files through photoshop as jpegs they end up around 600-800k. A 
friend has a Mavica which creates files of around 5-10kb.

Is the Sony Mavica able to compress better? Should I save as 
something else rather than Jpegs?

TIA

Kevin Lock