Question about Pentax MX 35mm SLR Camera

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Pentax MX Mirror Stuck In Up Position

The mirror on my Pentax MX is stuck in the up position, so that when I look though the viewfinder I see nothing. I have changed batteries, and it flips down correctly about 1/30 of the time after a shot. Is this a electrical connection problem, and what can I do to fix it? How much would a fix for this cost at a camera repair shop?

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  • hatan1 Aug 18, 2008

    The exact same problem plagues my MX every few years. I've spent enough on repairs and would like to know how to troubleshoot this myself. the previous comment said it's easy to do, but didn't explain how.
    Thank you.



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  • 15 Answers

This is a result of the linkage from the shutter release button being out of adjustment. It is a mechanical fault that can be repaired very easily.

Posted on Aug 29, 2007


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Since it's a film camera, there are a couple of things to check:
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2. If this is a single lens reflex camera, take the lens off and make sure that the mirror isn't stuck in the "up" position. If it is, GENTLY pull it down until it stays down. At this point, your shutter may be open. Try cocking the shutter again, fire off a test shot, and see if the mirror sticks in the up position. If it does, you probably need to replace the mirror bumper foam - age can make foam deteriorate into a gooey, tar-like substance that can make the mirror stick in the up position.
3. Does the camera have a T (for Time) setting on the shutter speed dial? If so, turn it off the Time setting and set it to a manual shutter speed such as 1/60 - or whatever your 'X' synch speed is.
4. Your batteries died in mid-exposure. Replace the batteries. You may have enough juice in them to show the viewfinder display, but not enough to finish the exposure and close the shutter.

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That will happen if the mirror is stuck in the up position and so blocking any light from entering the viewfinder.

Mirror lock-up is very common on 35mm SLR's like yours where the shutter is entirely electronically controlled and in most cases it's cured simply by fitting new batteries.

If this resolves your problem then please rate my answer, if not then add a comment instead to confirm that the batteries have been replaced and I'll try further options.

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Try new batteries first and if the problem remains please report back for further options.

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It maybe the case your mirror is stuck in the up position. Take the lens off and see if the mirror is lodged in its up position. If it is stuck get it repaired by a Canon technician

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As far as I am aware, you can use the viewfinder OR the live view, but not both at the same time.

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Switch between the two modes and double-check if there is a problem.

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