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WO 73iii Flattener.


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I'd ignore that diagram - it's for the FLAT 73 R  reducer. You have the flat 73A flattener..  If you check out the WO page for the flattener - New Adjustable Flat73 for Z73 - William Optics you'll see that you need a backfocus of 66.2mm from the back of the flattener.  As most DSLR set ups work out at 55mm from the sensor to the front of the T ring you would need to dial in 11.2mm on the flat73a adjustor. 

Graeme

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