[rollei_list] Re: Rolleiflash and Guide Number
- From: Mark Rabiner <mark@xxxxxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sun, 29 Nov 2009 09:55:05 -0500
> 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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