Westminster fountain at sunset

by Jorge Córdoba

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4
votes
1answer
741 views

How can I calculate the effect of non-TTL flash on exposure?

I recently got an old Canon AE-1 film camera back in working order. I'd like to use my modern 430EXII Speedlight flash with it, however since there is no TTL metering, I have no idea how much the ...
2
votes
2answers
148 views

Old Flash from the 70's

I have an old Consul 400 flash. It was distributed by Braun North America. I would like to figure what is the GN number at ISO 100, f/4, 10 feet.
2
votes
1answer
560 views

What is the relationship between Guide Number and flash power level?

From this post, I understand that the flash guide number (GN) is given by the following formula: Guide Number = Shooting Distance × f-number ÷ ISO factor I'm assuming that the GN calculated via the ...