Quote Originally Posted by Nick Zentena View Post
Hve you ever used tubes on a smaller camera? Cameras like the Mamiya RZ/RB actually have compensation guides on the side.
While a rb67 has guides on the side of the camera (great idea mamiya), you have to compensate for the macro tubes. Those values for the type 1 and type 2 tubes are listed in the macro tube documentation. Write if you need this info.

For LF lens.. measure the ratio of the extension at infinity vs the extension at your shooting focus. Multiply the time based on that ratio.

tim in san jose