I just picked some information on this page and will read it trough later. But w hat you should have in mind is whether or not you need the slide in back. I have recently added a binoc ular viewer on my camera and as a result, I am not using any more backs that require the glas to b e dismounted. I still use a modified Calumet 6x12 (I would not recommend it for many reasons) and adde d a Sinar Vario bought second hand (a delight in terms of precision and flatness). But I have no experience with the Zoom II. The Linhof 6x9 is "slide in" but not the 6X12 Techno Rollex, I think.
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