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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 22 Jan 2017 (Sunday) 20:52
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Can the 360ii HSS overpower the sun?

 
fplstudio
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Jan 22, 2017 20:52 |  #1

We know that in bright sunlight either in HSS or not bare speedlights struggle with overpowering the sun. Sometimes this happens also with the subject in shade and a bright background if the flash unit is not close enough.

How are the bare 360 godox/flashpoint units in this regard? Do you mind sharing some of your shots?

I have seen wonderful overpower-the-sun shots with the AD600 HSS and I am not sure about 360's performance.

Thank you


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Wilt
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Jan 22, 2017 21:20 |  #2

The Godox AD360 claims are 360WS and GN80 (m ISO 100, with standard reflector)
Converting the GN to feet, it is about GN260. So at ISO 100 (Sunny 16 1/100 f/16) the flash is capable of overpowering the sun by 1EV (f/22) out to 12' distance.


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Jan 22, 2017 21:36 |  #3

Wilt wrote in post #18252883 (external link)
The Godox AD360 claims are 360WS and GN80 (m ISO 100, with standard reflector)
Converting the GN to feet, it is about GN260. So at ISO 100 (Sunny 16 1/100 f/16) the flash is capable of overpowering the sun by 1EV (f/22) out to 12' distance.

Two significant things to consider about Wilt's calculations.
A, even with a softer modifier than the standard reflector, it will work at a reasonable distance from the subject.
Its rare to place a softbox 12 Feet from a subject. more likely 3 feet.

B, there are long throw reflectors that will get the light to the subject more efficiently than the standard reflector, which means that its possible, if one like harder shadows, to get a lot of AD360 light onto the subject.


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Wilt
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Jan 22, 2017 21:45 |  #4

On the point of softbox use, if you presume a softbox will cost you -1EV (if not more), its effective Guide Number drops from GN260' to GN180. So f/22 goes out to a distance of 8'.


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fplstudio
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Jan 22, 2017 23:29 |  #5

Wilt wrote in post #18252883 (external link)
The Godox AD360 claims are 360WS and GN80 (m ISO 100, with standard reflector)
Converting the GN to feet, it is about GN260. So at ISO 100 (Sunny 16 1/100 f/16) the flash is capable of overpowering the sun by 1EV (f/22) out to 12' distance.

When in HSS field your calculation should then bring you to a 6' working distance (2 stops loss) and this is with the standard reflector.


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Jan 23, 2017 09:50 |  #6

I have XPLOR600. Using softbox (both diffusion panels) at 6 feet I get f11 at full power without any HSS. I am using an extension head which looses 2/10 of a stop. Yes I did the measurements. Some say extension head looses 2/3 of a stop but my tests shots only 2/10 of a stop. When you go into HSS mode at 1/250 you loose 1.5 stops. Then for every increase in ss of 1 stop you loose 1 stop.

AD360II is half the power, isn't it. So I would buy AD600.


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Jan 23, 2017 12:51 |  #7

fplstudio wrote in post #18252963 (external link)
When in HSS field your calculation should then bring you to a 6' working distance (2 stops loss) and this is with the standard reflector.

He would have to ND it


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Post edited over 6 years ago by TeamSpeed. (7 edits in all)
     
Jan 23, 2017 13:23 |  #8

Wilt wrote in post #18252883 (external link)
The Godox AD360 claims are 360WS and GN80 (m ISO 100, with standard reflector)
Converting the GN to feet, it is about GN260. So at ISO 100 (Sunny 16 1/100 f/16) the flash is capable of overpowering the sun by 1EV (f/22) out to 12' distance.


I had to go out and learn some math to figure all those numbers out, whew!

I see that the 360 is advertised as GN56 and the 600 as GN87 from sites I have found. Seems to vary all over the place though depending on which of the different brands this goes under, and the sites themselves.

So if I learned anything by my reverse-engineering all of that since I have had no classes and had to google for GN calcs and relearn sunny 16, that means at ISO 100:

Streaklight 360: GN 185' -> 8.5' out to overpower the sun @f22
Xplor600: GN 287' -> 13' out to overpower the sun @f22

Does this look correct? With any kind of softbox on there, I will have to bring my aperture down accordingly to keep the same shutter, to make up for the lost light, or bring the light closer, correct? Bringing the light closer though introduces issues unless I put a large diffuser on it for full-body shots, which then puts me back into opening up the aperture to make up for that. (or use both my AD360s at nearly the indicated distances above, but more cumbersome).

This is stuff I need to pick up pretty quickly for senior portraits outside. I try to stay out of direct sunlight though when possible, but now that I have 2 AD360 units, I don't have to be so picky.


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Jan 23, 2017 13:40 as a reply to  @ TeamSpeed's post |  #9

TeamSpeed
The net of your calculations is correct. particularly in light of all the inconsistency of claims about Guide Number for the same units from different sources, the fact that you calculated GN185 vs. GN287, while my GN conversion works out to GN184 vs. GN285 is immaterial nitpicking.


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Jan 23, 2017 13:44 as a reply to  @ Wilt's post |  #10

great, thanks, it provides some thought on what I have to do once spring rolls around and photos pick back up.


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Can the 360ii HSS overpower the sun?
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