Re: [photo-3d] RBT/Spicer mount window differences

["David W. Kesner" <drdave@xxxxxxxxxx>]

John Goodman writes:

> Using the pushed out Spicer window paper chips as a gauge 
> against the RBT windows, it's clear that the Spicer 5p aperture 
> is wider than the RBT, while the 7p is a tad smaller.

I just checked the stock I have and the 5P Spicer mounts are a 
near perfect fit with the RBT 5p mounts (definitely not 
wider). The 7p Spicer mounts I have are also a tad smaller 
than the 7p RBT mounts. I tried a few dozen of each and all 
seemed to be the same.

> There are 
> probably slight differences between corresponding window 
> centers as well.

The aperture spacing seems to be equal on both 5p and 7p.

> So if one is treading these thin lines, delicate window settings 
> need to be previewed by laying the intended Spicer mount over 
> the RBT jig, prior to transfer. Or is this standard operating 
> procedure?  :>)

The difference is all but undetectable when an RBT is laid 
over a Spicer. The only way I could tell the difference was to 
punch out one of the Spicer apertures and place it inside of 
the RBT aperture.

Besides, if the Spicer aperture is smaller than the RBT 
aperture it wouldn't matter as the window would be smaller and 
you wouldn't have a violation. If the Spicer aperture is 
larger than the RBT aperture then you wouldn't be able to see 
this when you placed the RBT on the Spicer.

I am of the school that mounts "to the window" and I am very 
sensitive to window violations. I very rarely ever have any 
problem mounting with the RBT jig to Spicer mount - and I have 
mounted literally thousands of images this way.

Perhaps you have gotten a "bad" batch of Spicer or RBT's. Have 
you tried measuring several different mounts to see if there 
is a manufacturing tolerance. Perhaps there are subtle 
difference in the various dies used to cut or form the mounts.

David W. Kesner
Boise, Idaho, USA
drdave@xxxxxxxxxx


 

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