Out of the box the F6 is set to display possible shutter speeds from 1/8,000 of a second to 30 seconds. After 30 seconds the camera has the customary “bulb” setting, allowing you to trip the shutter manually (with something like the MC-30 cable release) for as long an exposure as you can hold the shutter release down for.

Custom setting B5 in the CSM provides the capability to extend shutter speeds beyond the default 30 seconds, unlocking extended shutter speeds before reaching the Bulb setting. When this option is enabled, after 30 seconds, you’ll see 40 seconds, then 50 seconds, etc. all the way up to 30 minutes before you reach “bulb.”

For some photographers this is an advantage if you do a lot of night shooting, for example, and exposures typically run between 30 seconds and 30 minutes. For others that […]