[rollei_list] Re: Flashbulbs

----- Original Message ----- 
From: "Jerry Lehrer" <jerryleh@xxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, May 31, 2005 10:40 AM
Subject: [rollei_list] Re: Flashbulbs


> Richard and Peter,
>
> I just dug out my GE book "Photolamp & Lighting Data"
> printed in 1963, which shows all the GE flashbulbs of that
> era.  There WERE M2s, M3s, and M5s (which bore no
> relation to #5. The M bulbs all had a miniature pinless 
> base.
>
> They showed the #50 bulb which produced 5 million lumens
> in a Edison screw base.
>
> Jerry
>
   The GE No.50 and Sylvania No.3 were meant to be used in 
studio reflectors with very slow shutter speeds (1/25th or 
longer) or open flash. A single bulb in a 12" reflector has 
a guide number of 600 for ISO-100 film. Thats f/6 at 100 
feet folks, try that with your stobe units. Remember, these 
are bulbs about the size of 150 Watt household lamp.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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