Lets suppose...we have an M body, and we want to determine if the RF is adjusted correctly, regardless of any lens, and indeed without the presence of a lens.

It seems to me that there ought to be a set distance from flange front to RF actuator for infinity that I could make up as a gauge, and another for say... I meter to test the RF linearity.

Given those two distances, being correct .005mm (I have no idea of the real tolorance there, but the flange/film tolorance is .01 so lets say half of that), I should be able to align the RF my favorite infinity object (the moon), and some object at 1 meter.

The question is... what are those flange/arm distances?

-- Charles (cbarcellona@telocity.com), February 24, 2002

Answers

"It seems to me that there ought to be a set distance from flange front to RF actuator for infinity . . ."

There's no doubt in my mind that this is true. After all, there's only one cam follower position that reults in the rangefinder images being coincident, no matter what lens is on the camera.

In the absence of any factory data, I think you could measure it if you have the means to measure the distance from the lens cam to the lens flange, with the lens remaining at infinity. The same measurement would have to be true within the camera as well.

-- Bob Fleischman (RFXMAIL@prodigy.net), February 24, 2002.

Charles, I don't understand why you need to make up two special gauges, one for infinity and one for 1 M ?

Is'nt it simpler just to use one standard lens to check the accuracy of RF ?

As for "1 meter", where do you measure the distance from ? from the front of camera ? from film plane ?

-- martin tai (martin.tai@capcanada.com), February 26, 2002.