Thursday, May 04, 2006
The Shutter Cam
Here is the famous metal shutter cam shown taped onto the 77DX motor unit. The shutter tension arm and shutter adjustment screw are not shown here, so you can view the squarish shaped hole in the cam, and get a good sense of its shape. This position of the cam corresponds to the figure 8 pattern, in other words, wide open. The small ribbon can be seen through the redirect tube (more on that later) and the screen. By varying the angle of the shutter, one can vary the size of the rear opening of the redirect tube, which is positioned tightly into the pole pieces and adjacent to the ribbon, with no air gap.
Posted by Bob Crowley at 10:21 AM