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Slow shutter speed, flashbulb and X-synch?

 
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Billy Canuck



Joined: 04 Apr 2006
Posts: 149
Location: Calgary AB Canada

PostPosted: Fri Jul 10, 2009 1:57 am    Post subject: Slow shutter speed, flashbulb and X-synch? Reply with quote

Another question from a flashbulb novice. I have a small stash (2 dozen) of no. 25 M-class bulbs. My Pacemaker 4x5 has a Supermatic (X) shutter with a solenoid.
I've posted before about calibrating the solenoid for M-class bulbs, and found out that's something I'd rather not try (flashbulbs being so expensive). To my surprise I found on the box the flashbulbs came in the info that you can use these M bulbs with an X-synch shutter at 1/25 second (and I imagine slower).
Can anyone confirm this? If this is right I'm all set.
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glennfromwy



Joined: 29 Nov 2001
Posts: 903
Location: S.W. Wyoming

PostPosted: Fri Jul 10, 2009 3:48 am    Post subject: Reply with quote

You're correct. It takes about 23 milliseconds for the bulb to reach it's peak output. That's just about what it takes the shutter to fully open at 1/25. Since the exposure is determined by aperture for the most part, you should be okay in dim light or darkness. For fill flash in sunlight you would normally set your aperture for the flah and the shutter for the ambient light. I'll let you figure out if that will work with X sync. Good luck.
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Glenn

"Wyoming - Where everybody is somebody else's weirdo"
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