see also:

• the Olympus OM-D system and how to make the most of it
• long exposure modes in Olympus cameras
• http://www.lessgearmorephotos.com/how-to-use-live-bulb-on-olympus-om-d-cameras-for-long-exposure-photography/

• another long exposure mode pioneered by Olympus in their Micro Four Thirds system
• essentially allows one to press the shutter release and HOLD it pressed to start the exposure then WATCH the image build up on the LCD screen, then when you think it has had enough exposure, you simply release the shutter release
• note: Olympus Live Composite mode may be even more useful for you!

• in the Menu, set:
  • Cogs E. Exp/ISO: BULB/TIME Timer to your maximum desired exposure duration (1-30 minutes)
  • Cogs E. Exp/ISO: Live BULB to the live view refresh interval (0.5-60sec)
    • NB. max. number of refresh displays are dependent upon ISO (9 for ISO 1600 to 24 for ISO 100)
• set IS to OFF (assuming you are using a tripod)
• select Manual exposure mode on the PASM dial
• select ISO and aperture
• set shutter to Live BULB
• press the shutter release and HOLD it pressed to start the exposure
• watch the screen
• release the shutter release to end the exposure