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RVO Horizon 72 ED Field Flattener Spacing/Back Focus

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I was recently allowed to purchase the excellently reviewed RVO Horizon 72 ED and field flattener but am struggling with the spacing/backfocus between flattener and sensor (1600mm). Its meant to be 55mm but test shots showed the sensor to be too close. I've increased the spacing to 60mm with the same results. Seems odd that I've increased it so much so doubting what I've done.

Has anyone else here had experience with this particular combination or can offer advice?

Attached is a shot from the other night showing my problem in the corners; trails all pointing to the centre. Please forgive the focussing.........



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