John,<br><br>Do yourself a favour, and use that LOT-switch.<br>Using a cable release (electric, or 'normal' with the adapter that was available), or your finger on the release, 'B' works exactly as it does on any other camera. But the battery will drain as long as you keep the shutter open.<br>Using the LOT-switch, it will not.<br><br>The release of the EL-models is mechanical, with an electromagnet activiting the trigger, tripping a catch. The same catch can be tripped mechanically by the LOT-switch. The difference is what else is tripped at the same time: using the LOT-switch, the release cycle is stopped - blocked rather - mechanically until you set it to O again. Using the release button or a cable, you are not so lucky, and you need to keep the magnet pulling (and drawing current).