around & about shooting raw

[clanthar]

So if I go from full power to half power, does that cut the light emission time in half as well or is it non-linear?

I'm not completely certain here but I'd say it's non-linear, an in this case to your advantage. By the time you get a typical "speedlite" down to 1/8th power I think the burn time on the flash tube is down around 1/40000 sec. (yep 4 zeros there).

Joe

 

[bazooka]

So if I go from full power to half power, does that cut the light emission time in half as well or is it non-linear?

I'm not completely certain here but I'd say it's non-linear, an in this case to your advantage. By the time you get a typical "speedlite" down to 1/8th power I think the burn time on the flash tube is down around 1/40000 sec. (yep 4 zeros there).

Joe

Awsome, thanks for the info, I'll put it into use next time I get the chance. Sorry to thread hijack, carry on!

 

[KmH]

Here is the approximate flash duations for a Nikon SB-600 hot shoe flash unit:

1/900 sec. at M1/1 (full) output
1/1600 sec. at M1/2 output
1/3400 sec. at M1/4 output
1/6600 sec. at M1/8 output
1/11100 sec. at M1/16 output
1/20000 sec. at M1/32 output
1/25000 sec. at M1/64 output

and for the top-of-the-line Nikon SB-900 spedlight;

1/880 sec. at M1/1 (full) output1/1100 sec. at M1/2 output1/2550 sec. at M1/4 output
1/5000 sec. at M1/8 output
1/10,000 sec. at M1/16 output
1/20,000 sec. at M1/32 output
1/35,700 sec. at M1/64 output
1/38,500 sec. at M1/128 output