Bruce, there are some more information on the Sinar system, different types and so on on
http://en.wikipedia.org/wiki/Sinar. The Sinar P, the older version of the P-type, has a chrome design, the newer P2 is all black, but the same functions, as far as I know, thus more a question of design than function. But there are two different rear bearer for the rear standard, both can hold a 8x10 carrier frame, but one, "bearer special", is particularly design for 8x10 (and 5x7); the "non-special" bearer can be used for 8x10 but will not be allow optimal movments, rather design for 4x5. When it comes to the front standard there are various possibilities for what often are called a "Sinar P 8x10". Not seldom the front standard is a Multipurpose standard hopefully with "long legs" which lacks many of the special nice features of a type P standard bearer, but it's a cheap and quite workable solution (have that combination myself). But a "real" 8x10 Sinar P has the P type bearer even for the front standard, and it should be the special longer bearer, even if it can work with the non-special front bearer designed for 4x5. A Sinar P 8x10 can thus be built in many different ways, and a "real" 8x10 will have both front and rear bearer of the special type allowing maximum movements in all directions. //Bertil