Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-13-2010, 09:38 AM   #1
New Member




Join Date: Jan 2010
Posts: 3
Rattling Pentax A 28mm F2.8

Hi All,

I've just bought an A 28mm F2.8 from ebay and when it arrive it was rattling. I tracked the sound to the front element which was able to rotate in the housing. When I rotated it clockwise however, it seemed to tighted as if on a screw thread.

I have no knowledge of the way these lenses are put together. Can anyone who owns this lens or has a knowledge of their construction tell me if this is normal?

Many thanks in advance.

Great forum by the way - I'm new here!

01-13-2010, 10:51 AM   #2
Loyal Site Supporter
imtheguy's Avatar

Join Date: Mar 2009
Location: Virginia Beach
Photos: Gallery | Albums
Posts: 2,950
Welcome to the forum.
I have a SMC-A 28mm f2.8 also and if it had rattled when I bought it a return would have followed. But I just tried to duplicate what you described and it was pretty easy. Just using the edge of my fingernails on the metal rim of the front element it does loosen/tighten up. Never tried to loosen it before but now I know. So that makes two of us anyway. My lens is very sharp also so it does not seem to be a problem. In fact, maybe its a way to de-dust inside the first element without real disassembly.
01-13-2010, 11:15 AM   #3
Veteran Member
dgaies's Avatar

Join Date: Oct 2009
Location: Maryland / Washington DC
Posts: 3,917
I used to have a A 28/2.8 and had the same issue until I just "screwed" the front element back in a little. Never was a problem after that. I almost returned mine too, initially, before I figured out what was wrong.
01-13-2010, 12:10 PM   #4
Pentaxian
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 4,814
I had a loose A28/2.8 too. There are three lens elements in an aluminum carrier, forming a group in front of the aperture. The carrier is threaded, and screwed into the lens body. So screwing it back in should work. The loose part would normally move in and out when the lens is focused, so as long as it can't shift up and down any more, the lens should perform fine.

There is a beveled ring inside of the filter threads, threaded into the filter threads. If you can unscrew that, you should have a little more access to the group carrier to tighten it more.

01-13-2010, 01:45 PM   #5
New Member




Join Date: Jan 2010
Posts: 3
Original Poster
That's awesome - thanks for the replies.

I can get out and try it properly now, safe it the knowledge it's not a duff!
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!
28mm, f2.8, k-mount, knowledge, pentax a 28mm, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
My Pentax DSLR makes a rattling noise - is it defective? Something is loose inside! Adam Maintenance and Repair Articles 4 01-18-2013 08:02 AM
Rattling sound in DA 18-55 WR lens? Loren E Pentax SLR Lens Discussion 1 10-19-2010 07:29 PM
DFA 100mm Macro Rattling Sound Youngster Pentax SLR Lens Discussion 1 10-17-2008 01:44 AM
Rattling SD card??? AKiss20 Photographic Technique 2 02-02-2008 12:59 PM
Just for fun - Takumar 28mm vs Pentax-F 28mm vs Pentax-FA 31mm ltd thePiRaTE!! Pentax SLR Lens Discussion 6 09-16-2007 01:35 AM



All times are GMT -7. The time now is 06:30 AM. | 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