As far as I know, the AE prism that comes with the SV pack is a cheap prism. You lose about 11/2 or 2 stop. Better opt for the true PRO AE TTL. I uses an ETRSi myself as I found that I needed the shutter leaf lenses. If you decided to use a shutter lenses for the 645 Pro, it will cost you considerably more than the lens for ETRSi. Just my 2cents.
Sugeestions/comments on Mamiya 645 Pro
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