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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 16 Jan 2017 (Monday) 02:55
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Umbrella or softbox size for full body shots?

 
Jocce
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Jan 16, 2017 02:55 |  #1

Whats size umbrella or softbox will I need to use a Hot Shoe flash for a standing full body shot?


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Jarvis ­ Creative ­ Studios
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Jan 16, 2017 03:35 |  #2

Can you further explain your setup please? are you planning on using the flash on camera or off? How many lights are you using? Just the one? This shot was done with 3 Profoto B1 monolights. The key light was in a 5 foot octobox and it still did not fully light her whole body evenly. I had to lighten her legs a bit in post.


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Jan 16, 2017 03:43 |  #3

Jarvis Creative Studios wrote in post #18245812 (external link)
Can you further explain your setup please? are you planning on using the flash on camera or off? How many lights are you using? Just the one? This shot was done with 3 Profoto B1 monolights. The key light was in a 5 foot octobox and it still did not fully light her whole body evenly. I had to lighten her legs a bit in post.

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I'm thinking Off Camera.

And If I would use only one light, how big would the modifier need to be to lighten fairly even over all of the body, head to toes?


/Jocce



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Jan 16, 2017 04:54 |  #4

Jocce wrote in post #18245813 (external link)
I'm thinking Off Camera.

And If I would use only one light, how big would the modifier need to be to lighten fairly even over all of the body, head to toes?

/Jocce

I would say as large as you can. 5' octabox is my go to. Or you could look into a parabolic umbrella like the photeck softlighter. But that's with a studio strobe. I don't recommend using a single speed light to try and light a 5' modifier.


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Jan 16, 2017 15:46 |  #5

The answer depends on how soft you want the shadows. Technically with enough distance and proper w/s, you could light the entire body with a very small modifier. If you double the distance between subject and light source, it illuminates a surface area four times greater than the one before.


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Jan 16, 2017 19:14 |  #6

smaeda wrote in post #18246363 (external link)
Technically with enough distance and proper w/s, you could light the entire body with a very small modifier. If you double the distance between subject and light source, it illuminates a surface area four times greater than the one before.

Exactly. If used up close, a light needs to be the same size as the subject to be uniform, while a point source will suffer inverse-square falloff. At a greater distance, either large or small light source will serve if the distribution of the source itself is uniform. So, a bare bulb can uniformly light a standing portrait. There are, of course, other issues like efficiency, stray light, and hardness of light. Two well-known lighting schemes for a uniformly-lit standing portrait: strip SB equal in height to the subject (soft), and dish/projector (hard).


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Jan 16, 2017 19:39 |  #7

A shoot through umbrella casts a much larger light than a softbox of the same size, and costs a lot less.

However, you end up putting light all over the place, and the light is not as even.


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Jan 17, 2017 09:44 |  #8

For softer shadows.. 5 foot diameter umbrella is a good start, 40 inch diameter, or there abouts can be used, but have some darkness and fall off issues towards the feet, and those are better for waist up shots.


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Jocce
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Jan 18, 2017 01:29 |  #9

Thank you for all the input :)


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Jan 18, 2017 21:32 |  #10

I own a 7 foot white (sort of) parabolic shoot thru umbrella that i use mostly for whole figure shoots.

I not too distant future i plan on getting something like Fotodiox Pro 88" Parabolic Reflector Umbrella Kit, or similar ... basicly a Broncolor 220 on budget.

Light is amazing and nothing out there beats what this light modifier does.




  
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Jan 19, 2017 19:33 |  #11

Get a huge 5in1 reflector (use the translucent inside part) or a scrim. Or hang a bathroom curtain. Or a sheer curtain. Hang this this near your subject (just out of camera view) and aim whichever modifier you chose at it.

Adjust relative distances to get the size you want.

Not soft or even enough? Add another one between the light and the first one and shoot through both.

Or get a huge piece of foam core or other large white surface (Home Depot or art supply store) and bounce the light off of it. You can add scrims or shower curtains between this and your subject if desired.

It's all size relative to subject. For soft=>Bigger. Or closer. Or both.


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tdlavigne
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Jan 20, 2017 02:08 |  #12

5ft Octa for sure, or 3ft with enough space to move the light back/up. Have also used whatever the large AB rectangular softbox is (I think 3x5'?) and their PLM's. Space and how much power you have available will be the biggest issue.




  
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Angmo
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Jan 20, 2017 08:00 |  #13

You can illuminate a standing person with a bare bulb or any size modifier. It all depends on you, your goals, and look you are trying to achieve.


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Jan 20, 2017 15:30 |  #14

Angmo wrote in post #18250181 (external link)
You can illuminate a standing person with a bare bulb or any size modifier. It all depends on you, your goals, and look you are trying to achieve.

What you wrote is technically true, but I'm not sure how it adds value to the conversation....

I think we have a sense the OP wants soft light, since they mentioned a softbox or umbrella. They also stated "And If I would use only one light, how big would the modifier need to be to lighten fairly even over all of the body, head to toes?" Which gives us an idea that fall-off is not desireable for their purpose. From this we can conclude that "bare bulb or any size modifier" is not going to help them achieve their goal.


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Jan 20, 2017 19:32 |  #15

F2Bthere wrote in post #18250591 (external link)
What you wrote is technically true, but I'm not sure how it adds value to the conversation....

I think we have a sense the OP wants soft light, since they mentioned a softbox or umbrella. They also stated "And If I would use only one light, how big would the modifier need to be to lighten fairly even over all of the body, head to toes?" Which gives us an idea that fall-off is not desireable for their purpose. From this we can conclude that "bare bulb or any size modifier" is not going to help them achieve their goal.

One size does not fit all. One answer does not answer all.

Expand your boundaries. Analyze them.

Perhaps you could try evenly illuminating a standing subject with a bare bulb and appreciate it can be done. Analyze the look compared to a fully diffused 4x6 softbox and discuss the merits of all options. Toss in an umbrella and so forth...

Beats criticism.


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Umbrella or softbox size for full body shots?
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