GMPhotography wrote:
See If I can put this in perspective to actually shooting . Let's say you have a group shot of 5 people in strong sunlight in the background and hitting them from behind so you need fill light. Today your shutter speed and sync speed is no greater than 1/250 of a second at lets say you want F8 to shoot at. Well F8 and 1/250 will not bring down the ambient light to match your flash output. Now lets say you can get F8 out of the flash but you cant't get the shutter speed faster with the global shutter now you can so lets say that balance point is 1/8000 sync speed. So you dropped the ambient light into that F8 zone. Remember the shutter speed is ambient light hitting the subject the Flash is basically the aperture setting to get F8 . So in essence you can balance this scenario better. Today you have to blast them with a flash that has to get to F16 at 1/250 sync speed to balance it out. So you need a lot of power, with global shutter you cut that need out as now you can balance the ambient light much better with shutter speed and drop the scene into that flash F8 zone you want to shoot at. Fo my 50 years I would have killed for this ability along with everyone on the planet. This is a big deal especially to commercial shooters and wedding shooters not to mention every hobbyist out there that did not buy 4 grand in lighting gear to get huge amount of flash power.
Now im still trying to understand the lingo here but this scenario is what you really want out of the global shutter at least in the flash area. Now we have the ability to raise the sync speed to match our flash output. In this scenario global shutter is controlling the Ambient light and Flash controls the aperture.
I want to try this really badly
Don't get too excited, global shutter + flash as of 2/2024 represents "unrealized potential".
This is because the kinds of strobes we need to make full use of global shutter do not exist!
Lets have a simple example:
suppose foreground exposure is good at 50ws (1/200s, iso 100)
but background exposure needs to be cut by 3 stops
Normally we use a 3 stop ND, but this means a big 400ws strobe is needed (50ws after punching through 3 stop ND)
Or HSS is used but a big strobe is needed once again
Now we can use an A9III, and push the shutter up by 4.25 stops (1/4000s) (3 stops to match the ND, +1.25 stop because base iso is 250) and theoretically use a 50ws strobe! this is what we want, get good results with just a speedlight.
However, this does not actually work because we need a strobe that emits 50ws at a T0.1 of 1/4000s
Now compare that to to the strobes we actually have:
Broncolor 800L - 3ws at 1/4580s and 6ws at 1/3000s
Profoto B1X - 16ws at 1/4780s or 32ws at 1/3800s
Godox AD600 pro - 31.3ws at 1/4090s
Godox AD400 pro - 25ws at 1/3930s
Godox AD200 pro - 12.5ws at 1/5630s or 25ws at 1/3420s
Ultimately this means we will still have to carry around big strobes because the small ones do not emit enough light at high sync speeds.... Docusync was using the AD1200
What we need is for someone to make a speedlight capable of outputting 70ws, but this 70ws needs to come out at a T0.1 of at least , 1/4000s preferably even faster.
Feb 07, 2024 at 10:34 PM
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