Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-26-2020, 08:21 AM   #1
New Member




Join Date: Nov 2015
Posts: 19
Pentax A 20mm f2.8 problem.

I have the Pentax A 20mm f2.8. It's a great lens and works fine. However, the cowling (as I'll term it) into which a filter and/or lens hood screws, is a little loose. It does not spin, so I can use it for its purpose, but it allows the attached filter and/or hood to jump a little as the lens is used. I've pulled back the rubber grip on the focusing ring, and I see two flush screws in slots, which I take to be for infinity adjustment. Also there are three small set screws in the same ring. I am afraid to take it any further without some guidance. Anybody seen this ?

10-26-2020, 01:19 PM   #2
Senior Member




Join Date: Apr 2011
Location: Drome, France
Posts: 206
I own a Pentax A 20mm F2.8 but do not understand exactly your problem.
Could you post a photograph of the cowling (filter screw thread)?
10-26-2020, 01:40 PM   #3
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 8,068
The filter thread ring/barrel is usually held in place by three or more screws under the black plastic ring around the front element (no lettering on most "A" series lenses). Unscrew this ring and tighten the screws. You might need to find a rubber stopper or bottle cap covered with electrical tape that will fit inside the filter ring to help remove the plastic ring. Wearing rubber gloves sometimes works depending on how tightly the ring is screwed in.

Although not the same lens the basic construction of the barrel should be the same. Go to around 1:40 to see how to remove the plastic ring and access the screws.

10-26-2020, 04:06 PM - 3 Likes   #4
New Member




Join Date: Oct 2020
Location: Chicago, IL
Photos: Albums
Posts: 4
Hi had this same issue with my A20 a few months ago. Remove the plastic ring (it's quite wide compared to other A lenses) with a rubber ring and tighten the three screws that hold on the focus ring. I've found the front of the A20 to be one of the easiest lenses to get apart.

10-28-2020, 01:48 PM   #5
New Member




Join Date: Nov 2015
Posts: 19
Original Poster
Thank you so much! Where do I get that rubber ring ?
10-28-2020, 02:18 PM - 2 Likes   #6
Pentaxian
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 12,854
QuoteOriginally posted by Petrock Quote
Thank you so much! Where do I get that rubber ring ?
That looks like the flush valve seal from an American Standard toilet.
10-28-2020, 02:20 PM   #7
New Member




Join Date: Oct 2020
Location: Chicago, IL
Photos: Albums
Posts: 4
I have a set of six rings from Japan Hobby Tool. Search for "Vacuum pad camera parts and lens opener."
10-28-2020, 02:24 PM - 1 Like   #8
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 39,956
QuoteOriginally posted by Petrock Quote
Thank you so much! Where do I get that rubber ring ?
I bought a set just last week from Japan Hobby Tools on Amazon...


amazon.com | Japan Hobby Tool Vacuum Pad Camera Parts Opener




Works well.


Steve

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!
20mm, and/or, f2.8, filter, hood, lens, pentax, pentax a 20mm, pentax service, repair, screws, service, warranty
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: SMC Pentax-A 20mm F2.8, SMC Pentax-M 20mm F4(sold) ChatMechant Sold Items 5 08-19-2019 01:23 PM
Wanted - Acquired: Pentax SMC-M 20mm f4 or SMC Pentax-FA 20mm F2.8 abdalian Sold Items 1 05-30-2016 01:28 PM
Wanted - Acquired: Pentax FA 20mm or Pentax A 20mm loveisageless Sold Items 2 01-13-2011 12:00 PM
K-5 battery problem? camera problem? user problem? imtheguy Pentax K-5 & K-5 II 39 11-03-2010 06:02 PM



All times are GMT -7. The time now is 04:46 AM. | 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