Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-14-2010, 12:57 PM   #1
Senior Member
dantekgeek's Avatar

Join Date: Oct 2008
Location: NYC
Posts: 100
DA21 Bug: Bump'n'Stick

I adore my lil' DA21; and its without a doubt one of my most used lenses. As a result (and because I tend to be unintentionally hard on my gear), I've discovered a weird quirk in the design of the lens, and was wondering if anyone else has experienced the same thing.

In short, a blow (or bump) of sufficient force to the front of the lens will cause the focus mechanism to bind; not completely, but it will jam up and feel as if the barrel is rubbing against itself.

The first time this happened, my heart sank– my favorite lens, ruined! Being a student, I hardly had the disposable income to replace it. After trying unsuccessfully to fix it by gentle tapping or turning, I gave up. Luckily, after moping around town the rest of the afternoon, the lens got *another* bump, and just like in the movies, everything was working perfectly again!

Being the worry-wart that I am, I did thorough tests to make sure everything was indeed working fine, and it was. Focus is fast, smooth, and accurate.

Since then, I've had the lens bumped a few more times, and every time, another fortuitous (or pained and carefully aimed) bump fixes it. Finally, the last time it happened, I experimented a bit and found that simply gripping the front barrel tightly and turning it counter-clockwise about half a millimeter fixes the problem every time, and that turning it the other direction can reproduce it.

I'm far from an expert on what goes on inside a lens, so I was wondering if someone might be able to shed some light on what might be happening in these situations, and if there's anything I can do to "tighten up" the mechanism (I figure being able to turn the barrel isn't a *good* thing).

10-14-2010, 01:00 PM   #2
Veteran Member




Join Date: Jul 2010
Location: Chicago
Photos: Gallery
Posts: 672
No light to be shed. Feel lucky it's fixed, and take better care of your gear until you can financially afford to be rough on it.
10-14-2010, 01:04 PM   #3
Senior Member
dantekgeek's Avatar

Join Date: Oct 2008
Location: NYC
Posts: 100
Original Poster
QuoteOriginally posted by Rory Quote
No light to be shed. Feel lucky it's fixed, and take better care of your gear until you can financially afford to be rough on it.
I absolutely feel lucky. The ironic thing is that 99% of the time I'm incredibly over-protective of my gear; its only when I'm working (shooting concerts or events) that things tend to get messy (but that's just part of the job, isn't it).
10-14-2010, 01:13 PM   #4
Veteran Member




Join Date: Jul 2010
Location: Chicago
Photos: Gallery
Posts: 672
Well, shooting engagements and weddings tend to be less rough than a concert, so I can understand. However, just like framing, you need to be completely aware of your surroundings when shooting a concert to try to minimize damage or injury.

10-14-2010, 01:17 PM   #5
Senior Member
dantekgeek's Avatar

Join Date: Oct 2008
Location: NYC
Posts: 100
Original Poster
QuoteOriginally posted by Rory Quote
Well, shooting engagements and weddings tend to be less rough than a concert, so I can understand. However, just like framing, you need to be completely aware of your surroundings when shooting a concert to try to minimize damage or injury.
Right. Being aware of your surroundings is equally as important as anything else. Unfortunately, its hard to control the actions of others which might lead to things getting broken (being slammed into the stage, against other people, etc)
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
barrel, bump, da21, fixes, focus, front, k-mount, lens, mechanism, pentax lens, slr lens, time
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
DA21 goes skiing PhilippeG Photo Critique 6 04-07-2009 11:01 PM
DA*16-50 vs DA21 Ltd dugrant153 Pentax SLR Lens Discussion 9 03-01-2009 11:15 AM
DA 12-24 vs DA 14 + DA21 and Pentax SLR Lens Discussion 19 07-18-2007 08:30 AM



All times are GMT -7. The time now is 06:13 PM. | See also: NikonForums.com, CanonForums.com 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?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top