Why is the RZ so popular?

And there's just one little thing we ALL forgot...

The RB/RZ67 can be fitted with a 6x8 back.
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What's required to fit a 6x8 back on an RB Pro-S?

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And the other thing we forget is stopped down most rb 67 lens will cover a 2 1/4 x 3 1/4 piece of sheet film in a graphmatic.
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What's the size of the image on the film in a grafmatic? 56mm x 78mm aprox.? A RB roll back is 56mm x 67mm aprox. Which lenses not stopped down won't cover the larger Grafmatic "23" holder image size?

Curt, I think the 6x8 back fits on all RB/RZ models. It's a motorized back; give it a google or two for threads here and there about it.