Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
10-09-2016, 05:20 AM   #1
Veteran Member
Site Supporter

Join Date: Sep 2014
Posts: 672
Pentax Aperture Block Failure Survey Results

A survey gauging the prevalence of aperture block failure among the Pentax K-30, K-50, and related models.

Read more on the PF homepage...

10-09-2016, 05:42 AM   #2
Audi 5 cyl's Avatar

Join Date: Mar 2015
Location: France
Photos: Gallery | Albums
Posts: 361
Interesting results, somewhat expected though.

I seldom see these failed cameras passing on ebay for as little as 40 EUR. So I got myself a K-30 (9000 clicks) and a k500 (1900 clicks). K-30 I am using for testing with diy lenses and m42 and k500 now works normally after a couple of weeks being on the "dark side". I also have a k-30 that works normally, which I bought used with some other faults last year.

If you play a lot with adapted and m42 glass, these faulty bodies give a lot of bang per buck.
10-09-2016, 07:09 AM   #3

Join Date: May 2010
Posts: 6,510
"To put things in perspective, our records show that we have at least 1799 K-50 owners and 2659 K-30 owners on the forum, so overall survey participation was at most 10% of our user base. As very few owners responded from outside the forum, undercoverage was a second source of bias. If more than a third of all K-30 bodies in existence had failed by now, we would hear much more about this issue!"

That is assuming they all knew about the survey and, with that assumption made, would care to participate in the survey. You set Pentax up to consider their hardware flaws then turn around and let them off the hook.

I think the fact that there is a single failure point so largely expressed is alarming to those products. That speaks of a flaw in that particular system. Especially when we do not read of failures in that same aperture block in K-5/K-5II/K-3/K-3II.
10-09-2016, 08:58 AM - 1 Like   #4
Site Supporter
Site Supporter
6BQ5's Avatar

Join Date: Jun 2013
Location: Nevada, USA
Photos: Albums
Posts: 3,304
I don't remember if I saw the survey or not ... hmmm!

I gave my K-30 to my dad with 30k shutter actuations on it and the aperture block was beginning to fail. He returned the camera to me with 43k clicks on it and every shot fails now. The camera is useless except for completely manual lenses. A used K-30 on eBay is about $250-ish. I don't think it's worth repairing the body unless the repair is like $20-$30. Just get a different body. Upgrade if you must!


  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
How common is the aperture block failure, really? wsteffey Pentax DSLR Discussion 100 06-29-2018 08:24 PM
Error Invalid year in SDM failure survey results bwDraco Site Suggestions and Help 9 11-25-2017 04:04 PM
Survey with shutter count and aperture block or shutter failure. macman24054 Pentax K-30 & K-50 256 12-30-2016 11:47 PM
Aperture Block / Shutter Failure lakeshore Pentax DSLR Discussion 37 09-17-2016 05:24 AM
Pentax Lens Survey: The Results kevinschoenmakers Pentax SLR Lens Discussion 82 06-06-2010 05:34 PM

All times are GMT -7. The time now is 11:23 AM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]