Buy doing a very quick tap on the shutter button will lock up the mirror but not release the shutter.
It's a bit tricky and it must be a very quick tap.
Next time you press the shutter button or use the self timer the shutter will work as usual and the mirror goes down for the next shot.
I have tested this on the SP and the SP II
Want to help me out?
Make my site known by sharing it with your friends and family.
This helps and would be really appreciated, thanks!
My facebook page