Thank you for your encouraging comments.
The film plane for the Shen Hao back is set back about 45mm. There is a focusing hood that is separate from the film holder. You focus using the one then swap to do the exposure. It is a bit cumbersome. Here's a link to one on eBay to see how it works: Shen Hao 6x17 6x12 6x9 Panorama Roll Film Back
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