I apologize if this has been asked before, but I searched the forums and could not find an answer.

Is it possible to identify the format of the Graflex RB cameras (Series B, D, Auto Graflex, etc) by the lens? It seems that most 3.25 x 4.25 I have seen have the kodak anastigmat no 32 6 3/8" while most 4x5 have the no. 33 7 1/2, but I do not know if this is a hard and fast rule or not. I have found a good deal on one, but the seller does not know the format or have any film holders and I am not close enough geographically to look at it myself.

Thanks

Being you posted this in the Graflex XL section instead of the Reflex section I assume you just clicked on the wrong link as they're next to each other.

As for your question the reflex series of cameras will accept any lens with a back focus long enough so that the lens will clear the mirror when set to infinity. The Series B is more limited as it has a fixed lens mount while the other models use lens boards that can accommodate various size lens barrel.

Have the owner measure the opening of the back where the curtain is visible both horizontally and vertically. This is the format size.