I shoot micro 4/3, APS-C, full-frame, 6x6cm, 6x7cm, 6x9cm, and 4x5 inch cameras. All are capable of producing great images. My personal favorite for half-length and head & shoulder portraits is the RB67 with 180mm lens.
Isn't taking a picture, "scanning", defeats the purpose of going to medium format? I would think lot of details are being lost with a smaller sensor of that camera.. instead of an actual scanner..
A 6x7 colour negative on ISO 200 film has resolution equivalent to approximately 18 megapixels. Faster film types will have less. Therefore a 24-ish megapixel digital camera with a sharp macro lens is ideal for scanning. The results I get from 6x9 negatives from a Fujica GL690, where the film resolution is equivalent to around 22 megapixels, appear to loose no sharpness when scanned this way. Many commentators who have compared both methods seem to come out in favour of using a camera to scan, rather than a flat-bed, for best image quality. However, it is always vital to ensure the flatness of the negative, its perpendicularity to the camera's axis and to accurately focus the macro lens on the film grain at around f8 and to check for sharpness over the whole area in magnified live-view before doing the scan.
