Some technical errors need correction...
1. The Polaroid uses a leaf shutter, so 'F' synch is NOT the applicable synch, it is 'M' synch!!!
2. 'F' synch is for flash bulbs designed to be used with Focal Plan Shutters
A FP synch bulb is a slow burning bulb.
M or F sync delays to it allows the bulb to fire and come up to full intensity before the shutter opens. Class M bulbs reach their peak illumination at around 20-25 milliseconds after ignition, and class F lamps reach their peak at approximately 5 milliseconds. Flascubes were M sync, in my over 45 years in photography I do not recall ever seeing an F sync bulb. Post 5 linked to an article, and that article clearly stated "an M3 flashbulb in the #268 Flashgun as intended for this camera"...the M3 flashbulb, very well known to me as I shot with them for almost 10 years, is an M sync bulb.
Last edited by wiltw; 01-12-2014 at 10:39 AM. Click to view previous post history.