Did some testing for close up shot with some explanation for those who want to know more details
1) This is shot using close up mode with ISO setting as high and no flash. This is shot at the minimum focus distance of 10cm.

2) This is shot using the same setup as above but add raynox dc250 (
click here to find out more on raynox). The minimum focus distance has reduced to around 6.5cm in this case.

Base on the sensor size of N8, which is 1/1.83" the magnification for 1) is around 0.06x and for 2) is around 0.125x. If you guys are interested, I can post the "ruler" shot that can show this calculation more accurately.
High ISO setting is used to increase the shutter speed and flash is not use because it make the subject too harsh.
Actually, you can use those cheapo magnifying glasses as well to increase the magnification, just that the image quality may not be as good... have fun playing around