[rollei_list] Re: Argomania
- From: aghalide@xxxxxxx
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 10 Jan 2010 13:40:10 +0000
Now I have an idea on what I can do with the Sylvannia giant flash bulbs they sent me when I requested just a few. ....my friend at Sylvannia sent me a case. They are sitting in my garage as we speak.
Ed Meyers
-------------- Original message from CarlosMFreaza <cmfreaza@xxxxxxxxx>: --------------
> I add the Philips PhotoFlux bulbs for cameras- portable flashes like
> the Rolleiflash, they dominated the European market; f.e.the PF/100E
> (light lamp for B&W) had a GN of 100 (meters; 328 feet) for ASA
> 100-125 films using 1/25-1/30 shutter speed with a common polished
> reflector; the GN for similar situation was 88 (meters; 289 feet) if
> the shutter speed was 1/50-1/60; BTW, the GN diminishes according the
> shutter speed is increased. The Philips PF/100 E/97, blue lamp for
> daylight color films shots, was balanced to produce about 5500º Kelvin
> color temperature for 22ms duration and 45000 lumens per second. These
> lamps for portable flash use were very powerful really.
>
> There were fast combustion bulbs intended for central leaf shutters
> and "open shutter" technique and slow combustion lamps intended for
> focal plane shutters. The bulbs had a spot to indicate its condition,
> if the spot was blue the bulb was right, if the spot became pink it
> was necessary to replace it.
> Rolleiflashes have a condenser to produce the energy to fire the bulb,
> they need an Eveready type 22.5v battery and the tension is enough to
> fire up to other two lamps simultaneously via "Blika" "Cekab" "Comka"
> and "Trika" dedicated wire connectors. I had the 2.8C Rolleiflash
> and never used it, I lost it with its bag dring a house move several
> years ago; we keep some photographs samples taken by my father using
> it, they look very good; my father has a little scar in one of his
> fingers from a burn caused by a bulb still hot.
> One of the professional uses for flashbulbs today is caves photography.
>
> Carlos
>
> 2010/1/10 Richard Knoppow :
> >
> > ----- Original Message ----- From: "Laurence Cuffe"
> > To:
> > Sent: Saturday, January 09, 2010 2:32 PM
> > Subject: [rollei_list] Re: Argomania
> >
> >
> >> Have a look at this site and see if anything looks familiar:
> >> http://www.meggaflash.com/
> >> I have a vested interest, they gave me some bulbs to play with years ago
> >> when I was a poor penniless students.
> >> All the best
> >> Laurence Cuffe
> >> On Saturday, January 09, 2010, at 01:05PM, "Don Williams"
> >> wrote:
> >>>
> >>
> > These were either General Electric Mazda No.50 or Wabash (later Sylvania)
> > No.3. Both were intended for use with "open flash" in studio reflectors.
> > Open flash is where the shutter is opened manually, the bulb or bulbs
> > flashed and the shutter then closed. The exposure is long enough to take the
> > total light output of the lamps. However, the delay between triggering them
> > and maximum light output was about 30ms so they could be used with an
> > adjusted synchronizer, for instance, for high speed photography.
> > Total light output for the General Electric lamp was 110,000 to 125,000
> > lumen seconds, with a peak of 6 million lumens, and it is stated that it
> > could be used with a 1/25th second shutter speed. The Wabash lamp was rated
> > at 140,000 lumen seconds and peak output of 6 million lumens.
> > Wabash does not show the light curve but GE does and the half power
> > points give about a 25ms duration.
> > Guide numbers are given in my source for GE and Weston numbers. For the
> > Wabash No.3 is was 560 for 1/25th second and an ISO speed of about 80. GE
> > gives a guide number of 700 for the same combination. Note that the type of
> > reflector makes a difference. Differences in the reflectors may account for
> > the different guide numbers.
> > These bulbs had about the maximum output available with flash other than
> > flash powder, which could produce perfectly enormous amounts of light.
> >
> > --
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx
> > ---
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