Kacey Reflector Grid w/1/4″ cell size-help please!

For those of you having a genuine Kacey Reflector Grid w/1/4″ cell size (the one selling for 115 bucks at the manufacturer's site: http://photos.smugmug.​com/photos/812881878_N​ZV7i-L.jpg
,please tell me what's the grid's thickness?
I'm on my way to build a grid for my DIY 19'' BD and I'd like around 30 degrees dispersion from it.Unfortunately,the only grid I have on hand has 1/4'' cells and every other grid mfg. I looked at uses 1/8'' cells,differentiated only by the grid's thickness.
Related to this:does anybody know what's the math for establishing the relationship between cell diameter/cell lenght (or grid's thickness)/spread diameter of light for a given BD diameter?
TIA!
Regards,

J.Doe wrote in post #14189968
For those of you having a genuine Kacey Reflector Grid w/1/4″ cell size (the one selling for 115 bucks at the manufacturer's site: http://photos.smugmug.​com/photos/812881878_N​ZV7i-L.jpg
,please tell me what's the grid's thickness?
I'm on my way to build a grid for my DIY 19'' BD and I'd like around 30 degrees dispersion from it.Unfortunately,the only grid I have on hand has 1/4'' cells and every other grid mfg. I looked at uses 1/8'' cells,differentiated only by the grid's thickness.
Related to this:does anybody know what's the math for establishing the relationship between cell diameter/cell lenght (or grid's thickness)/spread diameter of light for a given BD diameter?
TIA!
Regards,

To get a 30º coverage from a grid with a 1/8" cell, you need one that is about .23" thick. If the thicknesses of the grid material are given in fractions of an inch, the closest would be a 1/4" thick grid which will give you a coverage of approximately 28º.

The formula* is:

th = cs / tan θ

where th is the thickness of the grid material,
cs = cell size, and
θ = the angle of coverage desired.

*Disclaimer: This is the formula Lighttools uses to calculate the angle of coverage of their grids. Other grid makers may use a different formula which I'm not aware of.

PacAce wrote in post #14190432
To get a 30º coverage from a grid with a 1/8" cell, you need one that is about .23" thick. If the thicknesses of the grid material are given in fractions of an inch, the closest would be a 1/4" thick grid which will give you a coverage of approximately 28º.

The formula* is:

th = cs / tan θ

where th is the thickness of the grid material,
cs = cell size, and
θ = the angle of coverage desired.

*Disclaimer: This is the formula Lighttools uses to calculate the angle of coverage of their grids. Other grid makers may use a different formula which I'm not aware of.

Thank you PacAce,this is the kind of answer I was hoping for!
Just another question,though,since I don't quite get it fully (just looked at the Lighttools site but their calculator doesn't say much in this respect):
By "cell size",did you mean the cell's surface,or diameter,radius (in the case of round-shaped)?

J.Doe wrote in post #14190510
Thank you PacAce,this is the kind of answer I was hoping for!
Just another question,though,since I don't quite get it fully (just looked at the Lighttools site but their calculator doesn't say much in this respect):
By "cell size",did you mean the cell's surface,or diameter,radius (in the case of round-shaped)?

I used "cell size" the same way you did, i.e. the 1/8" size you said earlier. It's the diameter of the cell or the base length from one wall to the the opposite wall.

Oops. I just reread your first post and I thought you wanted the cell thickness for the 1/8" cell grid but I guess what you really wanted was for the 1/4 cell grid. If that's the case, the thickness would be about .43".