FYI, the widest lens whose specified coverage is enough for 6x17cm is the Schneider 72mm SAXL. The Shen Hao allows you to use the 72mm. You might get illumination from slightly wider lenses (e.g.. 65mm); however, the edges will not be much good and the fall-off will be extreme.
Speaking of extreme, the 72mm is extremely wide on 6x17cm. You will need the CF if you're shooting Chromes with this lens on this camera.
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