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Author Topic: 5D2 & Strobe Light Question  (Read 6417 times)

Drizzt321

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Re: 5D2 & Strobe Light Question
« Reply #15 on: July 13, 2012, 04:01:46 PM »
I don't think he was referring to that. See en.wikipedia.org/wiki/Tyvek.
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Re: 5D2 & Strobe Light Question
« Reply #15 on: July 13, 2012, 04:01:46 PM »

TrumpetPower!

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Re: 5D2 & Strobe Light Question
« Reply #16 on: July 13, 2012, 04:06:14 PM »
I found this type of packing material.  Took it with my iPhone, is this what you are reffering to?

I know the stuff you've go there, and I'm pretty sure it's also polystyrene. But it's not what I was referring to; I'm referring to those solid styrofoam blocks, like beer cooler foam. In fact, the lid from a throw-away foam beer cooler would do the trick.

But hold on a sec while I check to see if I've got any of that stuff...yes. It's a bit too translucent; you can see through it, which means that you'll be including the colors of whatever is behind it. But, when you fold it over a bunch of times, it's got a flat spectrum and about 43% reflectance, translating into D50 L*a*b* values of L* = 71.90, a* =  0.18, b* = 0.01. If it weren't for the translucency, that'd be better than any commercial white balance tool on the market that costs under a grand.

Cheers,

b&

Drizzt321

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Re: 5D2 & Strobe Light Question
« Reply #17 on: July 13, 2012, 04:39:14 PM »
I found this type of packing material.  Took it with my iPhone, is this what you are reffering to?

I know the stuff you've go there, and I'm pretty sure it's also polystyrene. But it's not what I was referring to; I'm referring to those solid styrofoam blocks, like beer cooler foam. In fact, the lid from a throw-away foam beer cooler would do the trick.

But hold on a sec while I check to see if I've got any of that stuff...yes. It's a bit too translucent; you can see through it, which means that you'll be including the colors of whatever is behind it. But, when you fold it over a bunch of times, it's got a flat spectrum and about 43% reflectance, translating into D50 L*a*b* values of L* = 71.90, a* =  0.18, b* = 0.01. If it weren't for the translucency, that'd be better than any commercial white balance tool on the market that costs under a grand.

Cheers,

b&

Ah yes, the great myth of "It's more expensive and labeled Pro so I must have it!" busted yet again  :)
5D mark 2, 5D mark 3, EF 17-40mm f/4L,  EF 24-105mm f/4L IS USM, EF 135mm f/2L, EF 85mm f/1.8
Film Cameras: Mamiya RB67, RB-50, RB-180-C, RB-90-C, RB-50, Perkeo I folder, Mamiya Six Folder (Pre-WWII model)
http://www.aaronbaff.com

TrumpetPower!

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Re: 5D2 & Strobe Light Question
« Reply #18 on: July 13, 2012, 05:24:06 PM »
Ah yes, the great myth of "It's more expensive and labeled Pro so I must have it!" busted yet again  :)

Well, to be fair, there are all sorts of thing with a "pro" label that are justifiably expensive that are far superior to the alternatives; a 400 f/2.8 comes to mind.

But, in this case...yeah, a 4¢ Tyvek envelope beats a $40 WhiBal, and a 2¢ styrofoam cup beats a $60 SpyderCube.

Cheers,

b&

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Re: 5D2 & Strobe Light Question
« Reply #18 on: July 13, 2012, 05:24:06 PM »