This app was mentioned in 3 comments, with an average of 1.67 upvotes
14mm is not that wide on a BMPCC. I just got a Rokinon 10M-MFT 10mm F2.8. If you want to see the field of view in advance, this is agreat app, https://play.google.com/store/apps/details?id=net.kadru.arriviewfinderfree&hl=en
I think you are talking about viewfinder app, if you are then here is a link for Android https://play.google.com/store/apps/details?id=net.kadru.arriviewfinderfree
but if you want to download for ios then search viewfinder i appstore..
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Excellent app to see in advance the field of view for any lens on the BMPCC https://play.google.com/store/apps/details?id=net.kadru.arriviewfinderfree&hl=en