Where to find octagonal softbox for speedlite with grid

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 Please drop a line here if you know where to get an octagonal softbox which allows both diffuser and grid. Thanks!

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

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?

FWIW, the Cheetah oxtabox includes a round mask.

I have two of these 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 under studio accessories they also have two soft boxes with similar construction.

dmward wrote in post #14225646
I have two of these 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 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

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

120CM Octaform

mrmarks wrote in post #14225733
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?

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

120CM Octaform

Same softbox with a grid

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.

dmward wrote in post #14227943
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.

dmward wrote in post #14227943
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.

K.C. wrote in post #14228005
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!

Wilt wrote in post #14228072
.. 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.

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

Why put grids on anything.

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

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

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

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.