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02-17-2015, 06:08 PM   #16
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QuoteOriginally posted by jarda-wien Quote
The camera started acting weirdly after about half a year of light usage. It seemed that the mirror would lock up from time to time (albeit not very often).
The camera couldn't focus at all and the viewfinder was very dim. Strangely, live view seemed ok.
QuoteOriginally posted by jarda-wien Quote
I got it repaired. Service said that the aperture mechanism got broken and confused the electronics.
This is a known issue with both the K-30 and K-50 and has nothing to do with the age of the lenses mounted. There is a common fault with the aperture control mechanism.

That being said, it is possible to munge the aperture actuator by mounting a defective lens. I know...I've done it...with a new lens fresh from the (not Pentax) factory. That is why I always do a thorough inspection of all lenses I purchase (both new and used) to check for any obvious damage and/or fault in construction.


Steve

02-24-2015, 04:09 PM   #17
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"You should use only "Genuine certified Pentax lenses" specifically designed for your camera to avoid voiding your warranty!" BRUHAHAHAHA! Sorry, couldn't resist!
02-25-2015, 12:22 AM   #18
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Hello all,

sorry for taking so long to react.

I can't seem to find time to devote to photography:-(

I decided to not use any of the older lenses until I can properly assess them. I was fortunate enough to have the camera repaired in warranty, so all went well.

Thank you all for your comments.

---------- Post added 02-25-15 at 08:23 AM ----------

QuoteOriginally posted by kodai84 Quote
"You should use only "Genuine certified Pentax lenses" specifically designed for your camera to avoid voiding your warranty!" BRUHAHAHAHA! Sorry, couldn't resist!
LOL -> couldn't resist:-P

---------- Post added 02-25-15 at 08:24 AM ----------

QuoteOriginally posted by stevebrot Quote
This is a known issue with both the K-30 and K-50 and has nothing to do with the age of the lenses mounted. There is a common fault with the aperture control mechanism.

That being said, it is possible to munge the aperture actuator by mounting a defective lens. I know...I've done it...with a new lens fresh from the (not Pentax) factory. That is why I always do a thorough inspection of all lenses I purchase (both new and used) to check for any obvious damage and/or fault in construction.


Steve
I am not sure that if this is a knows issue that it would only affect the K-30 and 50. I specifically asked the serviceman if the aperture mechanism on this midrange Pentax is any weaker than that of the higher models. He mentioned that they share the same mechanism...
02-25-2015, 02:11 AM   #19
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QuoteOriginally posted by jarda-wien Quote
I am not sure that if this is a knows issue that it would only affect the K-30 and 50. I specifically asked the serviceman if the aperture mechanism on this midrange Pentax is any weaker than that of the higher models. He mentioned that they share the same mechanism...
There are plenty threads about the K30/K50 where this has happened but I can't recall that I've seen threads for other models for this specific issue (might be me). But all models (after the K7 ??) seem to have some issue somewhere; mirror flop, lock up, ...

What I can't understand is that a known issue in the K30 continues to live in the K50; it should have been fixed.

There was a reason why the below sticker existed. Japanese quality was (long ago) (considered to be) crap and this was an attempt to improve Japan's image for production quality.


I'm sick and tired of reading about issues on any make/model. QC in the whole camera industry seems to suck big time.

03-08-2015, 01:08 PM   #20
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QuoteOriginally posted by aleonx3 Quote
I would think that if you have a sticky (or stiff) aperture blades in the lens, it can wear down the aperture lever on the camera. I am referring to k-mount only, m42 lenses does not have same mechanism, therefore, does not apply.


A stuck aperture pin can result in over exposure when the lens does not close down before the shutter does it thing.
I had this problem with a 28-200mm Pentax lens, I got way over exposed pictures, stopping the lens down further or increasing the shutter speed did not help.
Later I noticed the exposure was ok with the lens wide open, than I found the lazy aperture lever.




dean45
03-08-2015, 01:24 PM   #21
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QuoteOriginally posted by dean45 Quote
A stuck aperture pin can result in over exposure when the lens does not close down before the shutter does it thing.
I had this problem with a 28-200mm Pentax lens, I got way over exposed pictures, stopping the lens down further or increasing the shutter speed did not help.
Later I noticed the exposure was ok with the lens wide open, than I found the lazy aperture lever.




dean45
Not when you use stop down metering... it just would not stop down (or accurately). That's beside the point as the OP's question is referring to whether old or sticky lenses can break new bodies.
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