PBD,
OP said that he had to shoot at 1/200 and F11 and he HAD to use a much more powerful strobes to compensate for power loss:
... was using two 600 ws units as opposed to my usual very compact 360 ws units..
.
please note OP logic: had to shoot with higher power strobes than usual.
Now, I said exactly what you said: I pointed out that he did not go into HSS and therefore he lost NO power. hence no need using more powerful 600 Ws strobes instead of usual 360 Ws Op used.
In the second part of my comment I pointed out that if OP would rather shoot at F8 rather than F11 aperture he used to avoid HSS territory, there is a simple solution to open up aperture by 1 stop and loose relatively small amount of flash power.
OP had to use F11 at 1/200s, ISO 100 instead of F7.3 at 1/500s, ISO - these are identical exposures.
repeat:
no loss of flash power at 1/200s
if F8 was required instead of F11, then ND2 application will allow to open aperture up to F8 at 1/200s but strobes will have to be cranked up by 1 stop
.. Mind you flash duration times are pretty long at higher powers so once you go over 1/350 sec the shutter starts to limit your flash exposure power anyway..
Correct, GODOX AD360 II flash duration at full power is 1/300s. GODOX AD600B flash duration at full power is even longer: 1/220s.
privatebydesign said:
SecureGSM said:
your example shooting at 1/200s: you do not need to use HSS mode when shooting at 1/200s unless you are a Canon 6D user. Thus you do NOT loose any flash power. If F11 was too narrow for you, then you may have consider using decent ND2 (1 stop) filter to slow down the aperture by a 1 stop and shoot at F8 instead. Yes, this will result in a somewhat higher flash output, but you loose very substantial 2.5+ stops of flash power as soon as you crossed out of the X-Sync territory. Hence ND2 is a lesser of two evils. slight colour cast is very easy to compensate for in post.
Normalnorm said:
I just returned from a shoot for a magazine cover (lifestyle) where the subjects were facing away from bright sun. I had to shoot at f11 at 1/200 with ISO at 100. Flash shooting in a large umbrella to cover 4 people needs to be very powerful. ( was using two 600 ws units as opposed to my usual very compact 360 ws units) With the G1 X mk3 I could have used f7.1 at 1/500 thus using far less powerful flash and still maintaining decent DOF.
He didn't say he went into HSS so your comparison of ND2 1 stop loss vs HSS 2.5 stop loss is irrelevant. At 1/200 he didn't go into HSS so he lost none of his 1200Ws flash power. The point is the ambient required f11 at 1/200 at 100 iso, he couldn't give the ambient less because to do so would either push the camera into HSS or affect the flash exposure. The flash exposure required 1200Ws at f11 at 100 iso. The only way to beat the equations and lower the flash power while maintaining ambient exposure level is to raise the shutter speed and have a faster sync speed.
Mind you flash duration times are pretty long at higher powers so once you go over 1/350 sec the shutter starts to limit your flash exposure power anyway. People who thing a leaf shutter or global shutter will give them full power flash at high shutter speeds really are missing the concept of flash duration.