Assertion: flashlight's bulb | /r/Desires | a shutter speed of 1/15
Facets:
value: on x synch
type: LOCATION
value: to keep the shutter
type: PURPOSE
Source sentences:
text: The PF1 (along with the M2) had a faster ignition time (less delay between shutter contact and peak output), so it could be used with X synch below 1/30 of a second—while most bulbs require a shutter speed of 1/15 on X synch to keep the shutter open long enough for the bulb to ignite and burn.