[rollei_list] Re: Rolleiflash and Guide Number

> Mark, ISO 25 for electronic flashes was for the firsts electronic
> flashes, at the middle of the '60s it changed for ISO 50 and starting
> the '70s ISO 100 up to now including digital cameras.
> The best propaganda for a flash unit would be to show a high GN on an
> ISO 400 basis f.e.; I can't see an advertising advantage showing a low
> GN on a slow ISO speed basis.-


I'll compromise on it being  the very late 60's.
As I got started in photography in 1965 and was well used to the ASA 25
standard before I had to get used to the new one, 100 they got started on me
years later. 


Mark William Rabiner



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