Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-06-2011, 01:49 PM   #1
Inactive Account




Join Date: May 2011
Posts: 3
Sigma 70-300 APO DG stiff zoom ring

Hello from sunny Bulgaria

Well, I bought one Sigma 70-300 APO DG Macro the other day and I have little issue with it. The zoom ring is kinda hard to turn, especially after 200mm. I play with it today, when I am zooming from 70 to 300 zoom is smooth, backwards is very stiffy. If I turn the lens vertically so the front of it stays at the bottom it is stiff in all directions. If I turn the lens upside down so the front side stays on top zoom-in and zoom-out is smooth from one end to the other. I am confused and not sure if something is broken inside or it needs some lubrication. The person I bought the lens from said he didn't used it for a long time. I thought with some more turnings I will make it smoother, but I think it's a real problem. Any advice? Is it possible to lubricate it somehow and how exactly? It is out of warranty and honestly don't want to send it to the local service, it would cost me more than another used one for sure.

Thanks in advance.

05-06-2011, 03:57 PM   #2
Veteran Member




Join Date: Dec 2009
Location: Ontario
Posts: 550
I never had a problem with mine however the zoom ring is definitely more stiff compared to the pentax zoom. You mention that it is hard to turn after 200mm I am just worried that you might have a broken lens. I know the macro feature is selectable after that range and there is a locking feature to prevent zooming out of the range when active. Perhaps someone forced it out of the safety.
05-06-2011, 04:09 PM   #3
Senior Member
stevbike's Avatar

Join Date: May 2009
Location: Newbury, Ontario
Photos: Gallery | Albums
Posts: 268
I have a Pentax 28 to 80mm zoom lens that is stiff since it was new. That was 20 plus years ago. It has not affected anything in that time frame. It still is stiff but it works out for me. Just see how it goes over the next few months to see if it looses up at all.

For the price of getting it seviced you could be looking at getting another used lens in the same range if you can find one or just see how it goes with the one you have now. As long as nothing feels like nothing is breaking on it while zooming I thing you should be ok with it. Just keep a good eye on to see how it is working from now on.

My girlfriend bought one of these and has not used it too much. I did some test shots with it and found to be a nice lens.
05-06-2011, 04:22 PM   #4
Inactive Account




Join Date: May 2011
Posts: 3
Original Poster
Actually I forgot to mention that the lens is fully functional. Images, focusing, macro everything is working just fine. That's why I bought it, with hope that zoom ring will loosen up. Macro switch is working, locking also. I will try to find someone from the city with same lens to make one little comparison.

What do you think about this video
I have exactly same problem, same symptoms as he says. Is it too risky to try it? I never disassembled lenses.

10-11-2011, 04:36 PM   #5
Inactive Account




Join Date: Oct 2011
Posts: 4
hey da_durty any news? im having the same problem. did you do the video? thanks!
10-11-2011, 04:44 PM   #6
Inactive Account




Join Date: Oct 2011
Posts: 4
pls update!!! need help...
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!
apo, apo dg, dg, front, k-mount, lens, pentax lens, sigma, sigma 70-300 apo, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stiff regions on distance/focus ring. ytterbium Pentax SLR Lens Discussion 12 09-08-2011 10:49 AM
1.4 sigma apo teleconverter and 300 da* garyk Pentax SLR Lens Discussion 4 08-01-2010 08:22 PM
Stiff Focus Ring geauxpez Pentax SLR Lens Discussion 6 04-12-2010 09:34 AM
I'm Traveling, Want Inexpensive Telephoto Zooms : Pentax 55-300 Or Sigma 70-300 APO Christopher M.W.T Pentax SLR Lens Discussion 32 01-01-2010 07:48 PM
Sigma 10-20mm stiff zoom? yenemy Pentax SLR Lens Discussion 6 06-12-2008 07:23 AM



All times are GMT -7. The time now is 09:56 PM. | See also: NikonForums.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