MB, I owe you an apology. My GG looks just like yours; I had added some additional lines on mine inside the Sinar lines for another purpose. I use 5x7 film, but I've heard that 13x18 film has different dimensions and require different film holders; I can't recall the differences at the moment. I do know the differences are small and do make a difference. I'm going to track it down somehow.
Edit: Have a look at Post #8 in this link:
http://www.largeformatphotography.in...ighlight=13x18
So it seems there's no easily discernible difference in the framing of either image, which explains why Sinar's GG shows only one framing for either 5x7" or 13x18cm film. But the two film
cut sizes are different enough to cause problems and should be used with the appropriate holder size.
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