Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-07-2013, 03:21 PM   #1
Forum Member




Join Date: Feb 2012
Location: Sedona, Arizona
Posts: 54
Help with Pentax-F 70-210 zoom

I just bought a Pentax-F 70-210mm zoom on line sight unseen and it arrived today. While it looks pretty good, I immediately found two issues. The first is that the zoom seems very stiff. I own 3 other F series zoom lenses (80-200, 35-70 and 35-135) and they all zoom smoothly and with little effort. This lens requires you to squeeze the zoom ring tightly and turn hard! Is this normal for this lens? The other issue is what appears to be fogginess or a film on the inside of the front element when you look at it in bright sunlight. There is also an apparent circle the size of a dime visible in that film. So much for buying online from Goodwill!

03-07-2013, 03:34 PM   #2
Loyal Site Supporter
monochrome's Avatar

Join Date: Mar 2008
Location: Kirkwood (St. Louis) MO
Photos: Gallery | Albums
Posts: 20,430
I would not consider either of those conditions normal. My F70~210 zooms and focuses freely and the lens elements are clear.
03-07-2013, 03:45 PM   #3
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,140
QuoteOriginally posted by sandstone Quote
I just bought a Pentax-F 70-210mm zoom on line sight unseen and it arrived today. While it looks pretty good, I immediately found two issues. The first is that the zoom seems very stiff. I own 3 other F series zoom lenses (80-200, 35-70 and 35-135) and they all zoom smoothly and with little effort. This lens requires you to squeeze the zoom ring tightly and turn hard! Is this normal for this lens? The other issue is what appears to be fogginess or a film on the inside of the front element when you look at it in bright sunlight. There is also an apparent circle the size of a dime visible in that film. So much for buying online from Goodwill!
If the lens hasn't been used for a while, then the stiffness may go away after some use. This was the case with my A series 35-105mm lens. Not sure about the AF lens, though...

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

03-07-2013, 03:57 PM   #4
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,770
That lens should zoom freely, and of course having haze on the inner elements is not normal.

As Adam states sometimes you can free up a stiff lens by exercising it. This loosens up grease that may have gotten stiff. However, I have only seen this on A series and older lenses, the F series and newer all generally seem to move freely. Possibly a different type of grease, possibly a different design. Or maybe I've just never run into one with the problem.

Anyway, just one more reason to never buy anything from goodwill.com. Hope you did not pay too much for it. Good, nearly mint, ones go for maybe $100 plus or minus.

03-07-2013, 06:08 PM   #5
Pentaxian




Join Date: Sep 2009
Location: Southern California
Photos: Gallery | Albums
Posts: 3,181
I had a second copy of this lens for a short time, which IIRC I had to send back to the private party I got it from. It sounds almost like you got the same lens. Perhaps the zoom stiffness happens more often on this particular model, but even if it does that doesn't mean it's OK.
03-07-2013, 07:26 PM   #6
Forum Member




Join Date: Feb 2012
Location: Sedona, Arizona
Posts: 54
Original Poster
Thanks for all the help!

I appreciate all the responses, and figure I bought a bad lens. I'll see what the Goodwill Store in Eugene, OR that was selling the lens online decides to do. Hopefully they will refund my money, but you never know with all their disclaimers. You don't find any great deals on shopgoodwill.com and I think you take a much larger chance than on Ebay, where I have been stung before as well. That's what I get for exercising my LBA from the sticks!
03-07-2013, 08:24 PM   #7
Pentaxian
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 4,862
The front element probably is separating. I have one like that but not unusable. The zoom should be like the F35-135 in effort.
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!
film, k-mount, lens, pentax lens, pentax-f, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
zoom repair F 70-210 DeniseH Pentax SLR Lens Discussion 3 01-14-2013 11:18 AM
For Sale - Sold: Price DROP Kiron 70-210 zoom lock, Vivitar Series 1 70-210, MIR-1, Jupiter, alanjoke Sold Items 23 06-27-2012 09:38 AM
DA 50-200 vs DA 55-300 vs Vivitar S1 70-210 vs Pentax-A 70-210; Tele-Zoom Comparo PentHassyKon Pentax SLR Lens Discussion 16 04-28-2010 03:40 PM
Test Shot with K20D & smc Pentax F 70-210 Chr1st0ph3r Post Your Photos! 2 01-07-2009 09:19 PM



All times are GMT -7. The time now is 04:37 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