noah b
Established
Hey all, I'm curious about something on my 285. Usually I'll set the aperture to 2.8 and the flash to 1/16th power. If I pushed the flash to full power and set to f/8, would it turn out the same? I think it would but am unsure at this moment, and are curious if anyone else has faced this situation.
bmattock
Veteran
Well, let's see.
1/16 power versus 1/8 power should be double the light. f/2.8 to f/4 is double the exposure. So if you go from 1/16 power to 1/8 power, you should to go f/4.
That means 1/4 power is f/8, 1/2 power is f/16, and full power is f/32.
But honestly? I'm not sure. I think that's right. I guess I'd have to experiment with it.
1/16 power versus 1/8 power should be double the light. f/2.8 to f/4 is double the exposure. So if you go from 1/16 power to 1/8 power, you should to go f/4.
That means 1/4 power is f/8, 1/2 power is f/16, and full power is f/32.
But honestly? I'm not sure. I think that's right. I guess I'd have to experiment with it.
mh2000
Well-known
I'm pretty sure that you would be at f11 (1/16,1/8,1/4.1/2.1/1 vs 2.8, 4, 5.6, 8, 11).
I only used mine in manual mode on digital though... so I got to cheap and chimp my histogram... on film, always in auto-mode.
I only used mine in manual mode on digital though... so I got to cheap and chimp my histogram... on film, always in auto-mode.
bmattock
Veteran
Me, too, these days. I used to have to know all that stuff, but TTL (and P-TTL for my Pentax) is generally pretty reliable.
BTMarcais
Well-known
ditto for mh2000. f/11 it is.
charjohncarter
Veteran
On my Minolta, each halving of the power is equivalent to one stop. Therefore, if it is the same as mine; f8 is equivalent to 1/2 power. Like the others, full power is f11.
noah b
Established
Ah excellent, I've been experimenting with different bounce flash techniques and didn't want to completely botch a roll of film. thanks