Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-18-2022, 08:43 AM   #1
Pentaxian
VictorDA's Avatar

Join Date: Sep 2010
Location: Lyon area, France
Posts: 620
How to repair an FA* 24mm

Dear friends,
I got a very good deal (too good to pass) on a well-used FA*24mm.
So far I like the output of the lens and it works well in AF mode despite quite a bit of dust in the rear group.

However, I have a problem with the focusing ring when in "Manual" position:
Each time I reach the end of the focus scale there is a very soft stop (much lighter than on any DA lens I know; in fact it is only barey noticeable) and then it is really difficult to get the focus ring to "engage" again and drag the focus back within the scale. More often than not, I need to play with the clutch mechanism and/or squeeze the barrel quite hard while turning back. I'm not sure if that is clear?
For instance, focusing out, I will inadvertently go further than infinity with the ring; the scale and actual focus stay at infinity; and then turning back left, nothing happens and the lens stays stuck at infinity until I manage to re-engage it again. The same can happen at the close end of the scale.
Note that, as long as I stay within the scale, I have usually no issues at all. And AF has no problem at all either.

Does that ring a bell with anyone? Is that a common issue on FA*s with their "elaborate" mechanism? Is there a known fix?
Thanks

01-18-2022, 09:12 AM - 1 Like   #2
New Member




Join Date: Jan 2022
Posts: 8
I would advise to keep away from FA*24. It uses glued AL glasses. When the time is coming, I guess it is about 20 years. Many became to being hazed and it is irreversible. I had two examples but has the issue. One I had for 20 years from NEW.
01-18-2022, 10:24 AM   #3
Pentaxian
AfterPentax Mark II's Avatar

Join Date: Mar 2021
Posts: 1,141
QuoteOriginally posted by victordeamorin Quote
I got a very good deal (too good to pass) on a well-used FA*24mm.
It actually is not such a good deal as you thought and if I were you I would return it to the seller and ask the money back.
01-18-2022, 12:06 PM - 1 Like   #4
Moderator
Loyal Site Supporter
Loyal Site Supporter
pschlute's Avatar

Join Date: Mar 2007
Location: Surrey, UK
Photos: Gallery
Posts: 6,289
QuoteOriginally posted by cnarchitect Quote
I would advise to keep away from FA*24. It uses glued AL glasses. When the time is coming, I guess it is about 20 years. Many became to being hazed and it is irreversible. I had two examples but has the issue. One I had for 20 years from NEW.
Sample variation ?

Mine is 30 years old and is as good as new.

01-18-2022, 12:49 PM   #5
Site Supporter
Site Supporter
RobA_Oz's Avatar

Join Date: Nov 2008
Location: Tasmania, Australia
Photos: Gallery
Posts: 7,826
It sounds like the issue is with the clutch mechanism on your copy. Having never pulled any of my FA* lenses apart, I can’t be specific about it, but I’d guess that there’s some wear within it. It may be adjustable to account for the wear, assuming that’s what it is, but unless you’re fairly confident about doing it yourself, I’d take it to a competent lens technician for their assessment.
01-18-2022, 01:09 PM   #6
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 24,428
Donít use manual focus until you line up time to address the issue?
01-18-2022, 01:25 PM   #7
Pentaxian
VictorDA's Avatar

Join Date: Sep 2010
Location: Lyon area, France
Posts: 620
Original Poster
QuoteOriginally posted by UncleVanya Quote
Donít use manual focus until you line up time to address the issue?
That is my current approach, and as I said I am fairly satisfied with the lens under these circumstances.
I just asked here in case someone had experienced a similar issue, but so far I guess not.
Thanks!

01-18-2022, 04:22 PM   #8
Site Supporter
Site Supporter
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide,South Australia.
Photos: Gallery
Posts: 11,224
My copy of the FA*24mm f/2 had a centering issue that went unnoticed for years until I brought it out for comparison with the DFA21mm f/2.4 Limited, According to my technician it was a fairly easy fix.


QuoteOriginally posted by victordeamorin Quote
ach time I reach the end of the focus scale there is a very soft stop (much lighter than on any DA lens I know; in fact it is only barey noticeable) and then it is really difficult to get the focus ring to "engage" again and drag the focus back within the scale.
There might be damage to the gearing mechanism by the sound of your description.


The AF gearing on Pentax lenses seems to be fairly robust, my FA77 developed a crack in the gear train only after 10+ years of ownership and it developed what I would call a soft "bump" over which the AF drive refused to pass. With the exception of the cracked gear, the rest of the mechanism was in pretty good shape:

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!
af, focus, infinity, k-mount, lens, mechanism, pentax lens, repair an fa*, scale, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
To repair or not to repair? mysterick Digital Processing, Software, and Printing 14 12-21-2021 06:17 AM
Repair report - good experience with NSB-Tekunos repair zzaletel Repairs and Warranty Service 11 08-01-2021 08:28 PM
$600 to repair PENTAX LENS 24-70/2.8 ED SDM Precision Repair, terms of service renege weverka Repairs and Warranty Service 44 08-31-2020 01:38 AM
To Repair or Not Repair, Pentax 24-90 FA stemked Repairs and Warranty Service 5 08-20-2017 02:24 PM
Pentax 12-24mm vs Sigma 12-24mm & Tamron 10-24mm Comparative Review Adam Pentax SLR Lens Discussion 7 03-23-2012 03:07 PM



All times are GMT -7. The time now is 10:58 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