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masjah · 04/10/08, 06:12 PM

Isaac, I agree with Bill - your teacher is talking nonsense. A guide number of 65 feet means that with ISO 100 film, and an f/2 lens, you would have a maximum flash range of 32.5 feet. With ISO 400 film, it would be 65 feet. Not at all useless in my book!

04/10/08, 06:12 PM	#6 (permalink)
masjah Erfahrener Benutzer Join Date: 10/08/02 Location: Hull, UK. 973 Old Posts + Posts: 621	Re: Flash SF20 unit Isaac, I agree with Bill - your teacher is talking nonsense. A guide number of 65 feet means that with ISO 100 film, and an f/2 lens, you would have a maximum flash range of 32.5 feet. With ISO 400 film, it would be 65 feet. Not at all useless in my book! __________________ Best wishes. John John Howarth