Mirror lock up lever on F4

I just got an f4. First thing I did was test all the buttons and functions. I have a question for anyone with an f4. Is the mirror lock up lever supposed to be able to move the mirror without the exposure preview button pressed down? I can't lock the mirror without pressing the button and rotating the lever but I can still rotate the lever (not all the way) without pushing the button in, causing the mirror to come up with the button unpressed, however the mirror will come down as soon as I let go. Will I need repairs or is this normal.

on mine F4 you cannot rotate at all without pressing the button. Maybe on yours there is a little bit too much play?
But i understood you funcionality is the same?

Meinrad said:

on mine F4 you cannot rotate at all without pressing the button. Maybe on yours there is a little bit too much play?
But i understood you funcionality is the same?

Click to expand...

It's the same with my F4s.

To check and repair the mechanism, the mirror box has to be removed, which is a lot of work. So I would only do that if it no longer works.




Here is the mirror box of the F4, the blue rectangle roughly marks the area of the stop-down mechanism.