regards, Alan Chan
Okay, I've had one and one half bottles of wine, so judge as you may.
Are you sure the mirror went up??? I have discovered that the MX has a design fault. The interlock system that prevents the firing of the shutter until fully wound on, is crude. Apparently a Pentax designer/engineer wanted to improve it in an update but the LX was on the cards and the demise of the M series already in view.
It is possible to wind the MX on not quite fully (this is very fine, a matter of less than 1mm before full travel) and then fire the shutter. In this instance the mirror does not flip but the shutter fires resulting in a blank frame.
I used my CLA'd MX for a year with no trouble and then suddenly noticed this behaviour. I contacted my tech (Harrow Technical) in the UK and he explained the above to me. He adjusted the interlock and it is now very much better.
I suggest you use the MX making sure you wind on fully to the stop every time and see if the problem disappears. With patience you can induce the fault by deliberately winding on to just before the stop (this is very fine but strangely very easy to do when you're winding on for real) and then firing the shutter (if you can't fire it, wind on just the tiniest bit more) if you get it 'right' you'll hear the click of the shutter but the mirror sound and movement will be absent.
Let us know if this is the problem.
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