[rollei_list] Re: Rolleiflash and Guide Number
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 29 Nov 2009 11:28:17 -0300
Yes, the standard film speeds for the flash manufacturer standard GN
calculations were changing according the films evolved, but you can do
your own calculations for other film speeds of course.
I forgot to mention that "digital" no dedicated flashes like the Metz
I mentioned before can be used for analog cameras too, they are mainly
called digital because the flash trigger power is adapted to the
digital cameras electronics.
Carlos
2009/11/29 Mark Rabiner <mark@xxxxxxxxxxxxxxxx>:
>> It's interesting to note that some electronic Rolleiflash GN are given
>> for metres and DIN 18º ASA/ISO 50, for example the powerful E 36
>> models have a GN 36 but for ISO 50 film, newer GN for newer flashes
>> are given for ISO 100 film and then you have that the E 36 models have
>> a GN 72 for ISO 100 film and normal 50mm lens, (about 236 for feet).
>> There are a few regular flashes units today that have a similar GN,
>> f.e. the professional Mecablitz 76 MZ-5 Digital has a GN 76 (about 249
>> feet) but for a 105mm lens (it means the flash light is more
>> concentrated and can go farther), the GN for a normal 50mm lens is 54
>> for this Mecablitz and then you have that the Rollei E 36 models were
>> one of the most powerful regular flashes units ever made. BTW, they
>> don't have zoom and they can't vary the angle of the light and they
>> can't swivel and they don't have a second lamp for the eyes. The
>> Rollei E 36 RE was a successeful flash and was manufactured from 1973
>> to 1981 in Rollei-Werke, Braunschweig.
>>
>> Carlos
>
>
> I my memory the GN's were rated for 25 film then it went to the 100 film one
> year in the early 70's
>
>
> Mark William Rabiner
>
>
>
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