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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 06 Apr 2012 (Friday) 22:52
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Where to find octagonal softbox for speedlite with grid

 
mrmarks
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Apr 06, 2012 22:52 |  #1

I'm looking for an octagonal softbox that allows both a diffuser and a grid to be attached. I found one in ebay but it only allows either the diffuser or the grid to be attached http://www.ebay.com …ain_0&hash=item​3a6bf649b7 (external link) Please drop a line here if you know where to get an octagonal softbox which allows both diffuser and grid. Thanks!




  
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v35skyline
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Apr 06, 2012 23:59 |  #2

http://www.cheetahstan​d.com …Octa-36%22-Octabox/Detail (external link)


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Wilt
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Apr 07, 2012 00:36 |  #3

Some of us have pointed out, in the past, the octagonal shape of the modifier is readily seen in the catchlights of the eyes. Catchlights should mimic light sources that normally occur in the subject's environment. We have small round sources (the sun), larger round sources (which are not disturbing to viewers), square/rectangular shapes which mimic nearby windows...but who ever sees an eight-sided shape in anyone's environment (except within a photographer's studio, which is hardly 'normal environment') ?
As this comment points out, there is little real difference between light sources, other than cost or catchlight size and shape. https://photography-on-the.net …p?p=10820031&po​stcount=25
Unfortunately the example illustrations posted previously https://photography-on-the.net …p?p=10820031#po​st10820031 by a former POTN member are no longer to be seen. A great pity, as this comparison series is very seldom made available in this quality!

Is there some reason that you think you want an octagonal light source?


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v35skyline
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Apr 07, 2012 07:18 |  #4

FWIW, the Cheetah oxtabox includes a round mask.


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dmward
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Apr 07, 2012 12:07 |  #5

I have two of these (external link) I think they are as well built, maybe even better than the Westcott Apollo. Comes with a grid and diffusion panel. Both can be installed at the same time.

On the website www.phottixstore.com (external link) under studio accessories they also have two soft boxes with similar construction.


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mrmarks
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Apr 07, 2012 12:29 |  #6

dmward wrote in post #14225646 (external link)
I have two of these (external link) I think they are as well built, maybe even better than the Westcott Apollo. Comes with a grid and diffusion panel. Both can be installed at the same time.

On the website www.phottixstore.com (external link) under studio accessories they also have two soft boxes with similar construction.

Sounds great. Could you post some close-up photos of the diffuser and grid attachment area, if possible? Thanks




  
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K.C.
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Apr 07, 2012 21:52 |  #7

I'm with Wilt on this one. Why put a grid on an Octa ?

120CM Octaform

IMAGE: http://www.hensel.eu/typo3temp/pics/d3133fc221.jpg

Same softbox with a grid
IMAGE: http://www.hensel.eu/typo3temp/pics/5cb01d8572.jpg



  
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dmward
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Apr 07, 2012 22:08 |  #8

mrmarks wrote in post #14225733 (external link)
Sounds great. Could you post some close-up photos of the diffuser and grid attachment area, if possible? Thanks

Not sure what you are asking.
pic of the Octa with the grid attached?
Pic of subject taken with the grid and diffusion mounted on the octal?


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dmward
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Apr 07, 2012 22:10 |  #9

K.C. wrote in post #14227855 (external link)
I'm with Wilt on this one. Why put a grid on an Octa ?

120CM Octaform
QUOTED IMAGE

Same softbox with a grid
QUOTED IMAGE

What is interesting to me about theses Hensel examples is that the octal is too far away from the subject based on its size. It looks to be about 3 or 4 times the diameter when the generally accepted guide is for a modifier like an octal to be one to two diameters from the subject.


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K.C.
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Apr 07, 2012 22:22 |  #10

dmward wrote in post #14227943 (external link)
What is interesting to me about theses Hensel examples is that the octal is too far away from the subject based on its size.

Yeah those wacky German manufacturers just don't know what they're doing. :rolleyes:

dmward wrote in post #14227943 (external link)
It looks to be about 3 or 4 times the diameter when the generally accepted guide is for a modifier like an octal to be one to two diameters from the subject.

According to who ?

All the comparisons from Hensel are shot with the modifiers and model in exactly the same position. That's really the only way to give a valid comparison. The effects would be exaggerated by bringing the modifier closer and mitigated by moving it further away.




  
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Wilt
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Apr 07, 2012 22:35 |  #11

K.C. wrote in post #14228005 (external link)
According to who ?

All the comparisons from Hensel are shot with the modifiers and model in exactly the same position. That's really the only way to give a valid comparison. The effects would be exaggerated by bringing the modifier closer and mitigated by moving it further away.

According to light physics.

The problem is simply that a 'soft modifier' light source remains similar to the Infinite Plane of Light only as long as it is used within 2-3X the largest dimension of the modifier. Farther from that, and it starts to behave like a point source of light (harder shadow penumbra) rather than as a 'large' source.

One reason for using an octagonal modifier from 'too far away' is that the true shape of the catchlight is somewhat masked, especially if the sample photo is somewhat small. My wife saw a hex head screw in our refrigerator today...she thought was round, until I removed the screw with a hex head socket!


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K.C.
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Apr 07, 2012 22:38 |  #12

Wilt wrote in post #14228072 (external link)
.. remains similar to the Infinite Plane of Light only as long as it is used within 2-3X the largest dimension of the modifier. Farther from that, and it starts to behave like a point source of light (harder shadow penumbra) rather than as a 'large' source.

Point me to a demonstration that proves this.




  
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bobbyz
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Apr 07, 2012 22:57 |  #13

K.C. wrote in post #14227855 (external link)
I'm with Wilt on this one. Why put a grid on an Octa ?

Why put grids on anything.:confused:

BTW - You should be linking those shots, not embedding them.


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Wilt
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Apr 07, 2012 23:18 |  #14

K.C. wrote in post #14228080 (external link)
Point me to a demonstration that proves this.

Just shot this minutes ago...5" x 7" Wescott Apollo from 18" distance

IMAGE: http://i69.photobucket.com/albums/i63/wiltonw/IMG_6849.jpg


Same softbox at 66"
IMAGE: http://i69.photobucket.com/albums/i63/wiltonw/IMG_6850.jpg

Notice the difference in the shadow penumbra (edge transfer) when the modifier size is >3x its largest dimension


Now read this article, pages 25-27, http://books.google.co​m …stance%20specul​ar&f=false (external link) with shots at various distances using a 24"x24" softbox, and note the comment (last paragraph, p. 27) about how it is becoming specular at 7'...3.5X the largest dimension!

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K.C.
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Apr 08, 2012 00:11 |  #15

Actually you're proving my point with that image. Moving the light closer exaggerates it's characteristic. Far more telling than the penumbra is the highlight. It's large and specular in the first image and diffuse in the second.

I think the Hensel images are very descriptive of the subtle differences between modifiers. They chose to compare them from consistent distance to illustrate just that. They're not suggesting that's how you'd shoot with the particular modifier, but more importantly, offering a comparison with one variable, distance, controlled.




  
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Where to find octagonal softbox for speedlite with grid
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