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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 30 Dec 2014 (Tuesday) 17:52
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Light stand?

 
jeljohns
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Dec 30, 2014 17:52 |  #1

I have an Impact stand, 10 ft I think. I also have a 32" Impact umbrella. The stand toples over outside every time! Even when there is no wind. Now the umbrella is all bent. I want to get a 60" umbrella. Which stand will be strong enough to hold it?




  
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kaitlyn2004
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Dec 30, 2014 23:06 |  #2

Modifiers are like sails with any amount of wind. Were you weighing your stand down (i.e. sandbags on the legs)?


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Whortleberry
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Dec 31, 2014 06:07 |  #3

Even without considering the basic laws of levers established well over 2000 years ago, I'm wondering quite why you would even expect your lightstand to remain upright when it's inherently destabilised by the offset of the umbrella? As Kaitlyn mentions, use a sandbag or two - but place them for maximum effectiveness. Mechanical advantage (or disadvantage, to be pedantic) requires that the sandbag(s) be considerably heavier than you would perhaps anticipate because of their necessary placement so close to the centre of gravity.

An alternative would be to use guy-ropes where practicable.


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gonzogolf
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Dec 31, 2014 06:26 |  #4

Its not the stand strength. At worst it might be the width of the base, but it's the wind tipping your umbrella and stand. Sandbags help as does using an umbrella softboxes that catches less wind. These have the added benefit of being cheap enough that you don't mind dinging them up occasionally. http://www.amazon.com …keywords=umbrel​la+softbox (external link)




  
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jeljohns
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Jan 01, 2015 09:59 |  #5

Honestly, I was watching some videos on off camera lighting. I wanted to try a technique just shown in the video so I paused the video and went outside quick. In the video they did not use sandbags. In the back of my mind I thought about that, but didn't have a sandbag.

What kind of sandbag can be used on the stands? Do you guys make your own or buy them?




  
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Jan 01, 2015 10:03 |  #6

jeljohns wrote in post #17360383 (external link)
Honestly, I was watching some videos on off camera lighting. I wanted to try a technique just shown in the video so I paused the video and went outside quick. In the video they did not use sandbags. In the back of my mind I thought about that, but didn't have a sandbag.

What kind of sandbag can be used on the stands? Do you guys make your own or buy them?

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gonzogolf
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Jan 01, 2015 10:06 as a reply to  @ jeljohns's post |  #7

I use weights rather tha sand bags. I have a collection of ankle weights, plate steel weights from a weight bench, and occasionally use a gallon milk jug gilled with water depending on if I having to carry it far and water is available nearby.




  
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Alveric
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Jan 01, 2015 13:24 |  #8
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That stand is poor quality to begin with. I'm willing to bet that it's quite light, innit? If so, it has poor structural strength. Even with sandbags, the stress on the upper part (wind, or heavy lights/light formers, or —Heaven forbid!— a boom or grip arm) will bend it. Been there myself with such stands. Another 'feature' is that their legs are shorter, which makes them even more unstable.

I'd get another stand, like a Manfrotto 1052BAC.


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gonzogolf
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Jan 01, 2015 13:32 as a reply to  @ Alveric's post |  #9

Ive got an impact 10ft stand thats as solid as any manfrotto of an equivalent size.




  
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Alveric
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Post edited over 4 years ago by Alveric. (2 edits in all)
     
Jan 01, 2015 15:22 |  #10
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I've got a Westcott lightstand that is very portable (folds shorter than others and has a smaller footprint) that bent when I attached a grip arm holding a reflector to it. If the Impact stand is of similar quality... well. I've also got an Impact umbrella bracket that's total junk. I'm not buying B&H's own brand products again.

One thing, regardless of brand, though: the more sections a stand has, the less structural strength it has and the easier it'll bend.


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Carpe ­ Lux
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Jan 02, 2015 00:58 |  #11

Try replicating the stand-umbrella setup indoors first...same height, same leg spread. Then push on it from different directions to see just how stable it is in these windless conditions. Then start laying on the weight...bags, jugs of water, weights....all those are great suggestions. Test some more.

Once you've dialed in the support, try it outside. But never more than a breeze, these setups are inherently unstable....if it's windy then you need a VAL (voice activated lightstand=a friend to hold the stand/umbrella.)

P.S. I suppose you could also try stakes over the legs or tie-downs to save weight, but = more hassle & time.




  
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RicoTudor
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Jan 02, 2015 01:26 |  #12

Tying your stand to the ground is a guy thing.


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Jan 02, 2015 06:50 |  #13

RicoTudor wrote in post #17361645 (external link)
Tying your stand to the ground is a guy thing.

:lol:


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Jan 02, 2015 10:20 |  #14

gonzogolf wrote in post #17358700 (external link)
Its not the stand strength. At worst it might be the width of the base, but it's the wind tipping your umbrella and stand. Sandbags help as does using an umbrella softboxes that catches less wind. These have the added benefit of being cheap enough that you don't mind dinging them up occasionally. http://www.amazon.com …keywords=umbrel​la+softbox (external link)

^
Base circle diameter of the legs is insufficiently large to overcome the weight (umbrella/ribs) at the end of a lever arm (the umbrella shaft) even with zero wind.


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Light stand?
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