Um, to muddy the water a little, there are 2x3 monorails. Modern ones are highly precise, heavy, and expensive. There are, though, older ones that sometimes sell for relatively little. A couple of centuries ago when I was thinking about moving up to 2x3 from 35 mm I looked into the 2x3 Galvin, wasn't thrilled by what I saw. Got to touch a 2x3 Linhof Color (Technika on a rail, very heavy) that scared me away from 2x3 view cameras for years. Instead I got a 2x3 Graphic, absolutely not a view camera, that met my needs but won't meet yours, Brian.
Originally Posted by brian steinberger
When one of my friends was on his deathbed he gave me his 2x3 Cambo SC (SC-1). I've since bought another for a little over $100. Also a complete 4x5 SC for parts to make a camera with a 2x3 front and 4x5 rear, the better to shoot 6x12. The 2x3s are no less precise than the 4x5 and considerably smaller. Cambo SCs aren't precise enough for digital because they have friction focusing and their movements aren't geared; for digital you want something a lot more modern and expensive. 2x3ers seem to pop up around once a quarter, typically sell for no more than $200-300. If you want one, watch patiently ...
Very capable used 4x5 monorails that accept roll holders can be had for a small fraction of the amount you propose to spend. The Sinar system is vast and well-supported. Same goes for Cambos like mine.
Brian, about focal length equivalences. The normal lens for 2x3 is 100 mm, the normal lens for 35 mm is 43 mm; that people think of 50 mm as normal for 2x3 is due to an historical accident. The 2x3 equivalent of 28 mm on 35 mm is 65 mm. 50 mm, 116 mm. My little Cambos will focus a 47 Super Angulon on a flat board to infinity. My 6x12 rig will make infinity with a 35 on a flat board.
Good luck, have fun, and accept that whatever you do will be wrong,