Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-15-2013, 01:21 PM   #1
Site Supporter




Join Date: Dec 2012
Location: Montréal QC
Photos: Gallery | Albums
Posts: 1,827
Inifinity focus impossible @ 35mm on 35-105mm F3.5 Pentax-A zoom?

Hi all. I recently came into possession of this well regarded Pentax-A zoom, and I have one small question... The lens doesn't seem to be able to reach infinity focus at less than 50mm. Is this normal? What I see is that if I have the lens set to (for example) 1.5m focus, I can turn the zoom dial to 35mm. But if I then proceed to turn the focus dial towards infinity, the lens also simultaneously zooms, reaching about 50mm @ infinity focus. At this point, I can not turn the zoom dial back towards 35mm unless I turn the focus dial back. Is my copy defective or is this behavior normal? Thanks for any insight.

01-15-2013, 03:02 PM   #2
Inactive Account




Join Date: Jul 2010
Photos: Gallery
Posts: 328
Hi

You have a problem, does the focus ring move in and out of the macro range ?
Turn the focus ring to the left until it stops then you should be able to push it forward and then be able to rotate it into the green macro position.
I have one of those and the focus and zoom are completely independent.
01-15-2013, 03:44 PM   #3
Site Supporter




Join Date: Dec 2012
Location: Montréal QC
Photos: Gallery | Albums
Posts: 1,827
Original Poster
Thanks bobpur. I have found the problem, and it was both simple and embarrassing, though thankfully quite fixable. The lens has a generic front cover with an elastic band tying it to the lens to avoid losing it. As it happens, the elastic was over the part of the barrel that need to retract itself into the rest of the lens in order to reach infinity focus at 35mm. Thus the lens was physically impeded in its movement by the width of the elastic band, producing what I described in my first post above... As Homer Simpson would say: "Doh!" (I guess it's preferable to be a little embarrassed rather than having a broken lens!) After moving the elastic out of the way, everything's now working fine. And yes, macro mode engages properly. Thanks for your feedback!
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!
50mm, focus, infinity, k-mount, lens, pentax lens, pentax-a, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax A 35-105mm f3.5 JeffJS Lens Sample Photo Archive 31 04-30-2016 12:25 PM
SMC Pentax-A 35-105mm F3.5 kevingun Troubleshooting and Beginner Help 2 10-19-2012 05:21 PM
Focus slack - A 35-105mm f3.5 Jean Poitiers Pentax SLR Lens Discussion 4 05-30-2012 01:22 PM
For Sale - Sold: Pentax-A 35-105mm f3.5 dj_saunter Sold Items 3 04-28-2012 10:52 PM
Help with repair Pentax A 35-105mm f3.5 sekelsek Pentax SLR Lens Discussion 7 08-31-2011 06:39 PM



All times are GMT -7. The time now is 12:36 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