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04-28-2013, 01:32 AM   #1
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Pentax M 50 mm F1.7 lens rattle

Good day,

If anyone has the Pentax M 50mm F1.7 lens, can you please tell me if you shake it, move it, does it make a sound like something is loose in it (big gaps between the Diaphragm maybe) ?
Mine was accidentally dropped on the carpet and I never heard this sound, or maybe I didn' t pay attention to it (hopefully) .

Thanks for any help!

04-28-2013, 02:07 AM   #2
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I have one, but never noticed a noise up to now... will give it a good shake when I come home and report to you. What about yours, does it still "work as expected"?
04-28-2013, 09:14 AM   #3
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QuoteOriginally posted by wullemaha Quote
I have one, but never noticed a noise up to now... will give it a good shake when I come home and report to you. What about yours, does it still "work as expected"?

Good day,

It still works for now as expected, but it is strange in my opinion for it to do this.

Thank you!
04-28-2013, 09:29 AM   #4
dms
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The front ring with lens info, and/or the small screw (3 of them) underneath, often loosen with usage--an easy fix if its that.

04-28-2013, 09:44 AM   #5
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QuoteOriginally posted by dms Quote
The front ring with lens info, and/or the small screw (3 of them) underneath, often loosen with usage--an easy fix if its that.
Good day,

Unfortunately i can not open the for main screws, they are very stuck. And now i' ve lost one of the three screws that fixed the ring on the final part of the lens (that enters in the camera) - great!
04-28-2013, 11:29 AM   #6
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Don't remove the mount end it has nothing to do with the screws in question. You unscrew the front ring that has the writing on, it is where you screw the filter on.
Use a rubber cap, just be sure it has a high place in the center so as not to hit the lens glass.
Under that ring you will see the screws. They are for locking the focus ring after adjusting the infinity focus.
This link will show how
https://www.pentaxforums.com/forums/do-yourself/153858-how-remove-fungus-50mm-f1-7-lens.html
04-28-2013, 07:23 PM   #7
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Hmmm. Put a finger on the aperture stop down lever before you shake it. You may find that is the cause of the rattle. That's normal. No worries.
04-28-2013, 08:32 PM   #8
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QuoteOriginally posted by Canada_Rockies Quote
Hmmm. Put a finger on the aperture stop down lever before you shake it. You may find that is the cause of the rattle. That's normal. No worries.
Good day,

I press the lever and it still makes a shaking sound (like from inside) . I push the lever down for the diaphragm to be open, then it dims a little bit.

Thank you!

04-28-2013, 10:10 PM   #9
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Mine has had a rattle when not mounted since the day it was new.


Steve
04-29-2013, 08:18 AM   #10
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QuoteOriginally posted by urssu Quote
Good day,

I press the lever and it still makes a shaking sound (like from inside) . I push the lever down for the diaphragm to be open, then it dims a little bit.

Thank you!
If you hold the aperture lever, there should be no sound heard when shaking the lens. Sounds like a necessary repair job.
04-29-2013, 08:57 AM   #11
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QuoteOriginally posted by stevebrot Quote
Mine has had a rattle when not mounted since the day it was new.


Steve
I agree with Steve on this one. My m 50/1.4 has had rattle since inboughtbit new in 1982.

Still works ferfectly.

Tom G
04-29-2013, 11:39 AM   #12
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QuoteOriginally posted by urssu Quote
Good day,

Unfortunately i can not open the for main screws, they are very stuck. And now i' ve lost one of the three screws that fixed the ring on the final part of the lens (that enters in the camera) - great!
Sweep the area with a strong magnet. The rare earth magnets used in headphones or hard drives are great for this.
04-30-2013, 09:06 PM   #13
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QuoteOriginally posted by stevebrot Quote
Mine has had a rattle when not mounted since the day it was new.


Steve
To expand a little bit, this question comes up a couple of times a year regarding this lens, though the M 50/1.7 is not the only lens I own that has a small rattle.


Steve
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