" the 75H has the 1 shot and 4 shot multishot modes, but it does not have the 16 shot mode of the 54 H."
I think 16 shot is a hangover from native 6MP chips where a file of 16*6*3 228MB was required
Does any one need a 16*33*3 file 1528MP is not really needed and hard to compute
16 shot is very fiddly
(this is conjecture an I think the umbers are wrong but you get the idea)
"Considering that I already have the cameras,"
Be aware that
-you can use almost any back on a sinar camera (exept h2d,h3d??)- not just sinar backs
-anything that will go on a P2 will go ony any F or P camera
I have little knowledge if the RB system - it is not much listed for compatabliiity with backs while the RZ is - are the lenses the same - could you swap?
You are still not seeming to register that I would consider using a sliding back adapter and a single shot back with the sinar
You can use this to make two exposures that are then stitched together (phase/C1 automates this)
You will still have moire issues (that are only relvant for clothand gratings) but a massive file and you dont need to get electronic shutters for your sinar
With this single shot back you would need to probably get a new MF system but a contax or Mamiya 645afd is pretty chaep (or even 645 pro TL with sinar)
You can use a hassy back on the v system too..http://www.hasselblad.com/media/890fe86e-d...cbb12-CF_UK.pdf
WHich is much cheaper than an H system
Ultimately the Hassy CF-MS seems generally ahead of the game becuase it is both multishot and can be untethered for single shot
THe reason I like Sinar backs is that you can change system with thier range of adapters in a way that is not possible with phase or leaf which have to go back the factory
It is all down to money and convienece in the end you must find your own position on this scale