Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-04-2016, 08:42 AM   #1
Pentaxian




Join Date: Sep 2008
Location: Phoenix, AZ
Posts: 1,432
DFA 150-450 Zoom Ring Stuck

Had the strangest thing happen to the DFA 150-450 we just took to east coast.

The zoom mechanism will not go BELOW about 180mm.

It work fine from 180-450, but will not fully contract.

I'm nearly certain it's a zoom lock issue, as in somehow the zoom lock engaged with the zoom beyond its locking point.

Any ideas on fixes before I have to deal with the horror of sending it in for warranty repair?

10-04-2016, 08:55 AM   #2
Moderator
Loyal Site Supporter
BigMackCam's Avatar

Join Date: Mar 2010
Location: North East of England
Posts: 6,245
I don't have that lens, but have you tried pointing it up/down while operating the zoom mechanism?
10-04-2016, 09:47 AM   #3
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 9,750
This has happened to several other people - send for repair.
10-04-2016, 10:43 AM - 1 Like   #4
Loyal Site Supporter




Join Date: May 2011
Location: Richmond, Virginia USA
Photos: Gallery | Albums
Posts: 2,642
QuoteOriginally posted by nomadkng Quote
Had the strangest thing happen to the DFA 150-450 we just took to east coast.

The zoom mechanism will not go BELOW about 180mm.

It work fine from 180-450, but will not fully contract.

I'm nearly certain it's a zoom lock issue, as in somehow the zoom lock engaged with the zoom beyond its locking point.

Any ideas on fixes before I have to deal with the horror of sending it in for warranty repair?


Beware of them claiming IMPACT DAMAGE plus they will send it off to Japan

10-04-2016, 12:35 PM   #5
Pentaxian




Join Date: Feb 2015
Photos: Albums
Posts: 3,224
QuoteOriginally posted by nomadkng Quote
Had the strangest thing happen to the DFA 150-450 we just took to east coast. The zoom mechanism will not go BELOW about 180mm. It work fine from 180-450, but will not fully contract. I'm nearly certain it's a zoom lock issue, as in somehow the zoom lock engaged with the zoom beyond its locking point. Any ideas on fixes before I have to deal with the horror of sending it in for warranty repair?
Et voila !!! One more time. DFA150-450 is weather sealed like a air pump. Everytime time you force the zoom in or out in excess of the force that dislodge the sealings, you can't get the zoom back in place when the inner sealing at out of their place. I wrote this in previous thread about DFA150-450, but never mind.
10-04-2016, 01:05 PM   #6
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 9,750
QuoteOriginally posted by biz-engineer Quote
Et voila !!! One more time. DFA150-450 is weather sealed like a air pump. Everytime time you force the zoom in or out in excess of the force that dislodge the sealings, you can't get the zoom back in place when the inner sealing at out of their place. I wrote this in previous thread about DFA150-450, but never mind.
Uh... typos? Really hard to decipher this last bit. So what is the fix?
10-04-2016, 01:45 PM   #7
Pentaxian




Join Date: Feb 2015
Photos: Albums
Posts: 3,224
QuoteOriginally posted by UncleVanya Quote
Really hard to decipher this last bit. So what is the fix?
There is no fix after sealing is moved. Prevention is to never force the zoom in or out with force, in order to let the sealing glide and prevent "pump" effect. When I zoom out , I do it slowly without forcing , and zooming in the same way.
I can do it 200 times, and I never have a single issue. If I want to damage my DFA150-450 I zoom out fast and it's sure way of getting the seals pulled back in the inner rear of the zoom.
10-04-2016, 01:50 PM   #8
Moderator
Loyal Site Supporter
BigMackCam's Avatar

Join Date: Mar 2010
Location: North East of England
Posts: 6,245
^^^ I've heard of a similar zoom issue on the DA*60-250 (although I've not had the problem myself). I wonder if it's the same thing? Very interesting...

10-04-2016, 02:07 PM - 1 Like   #9
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 9,750
QuoteOriginally posted by biz-engineer Quote
There is no fix after sealing is moved. Prevention is to never force the zoom in or out with force, in order to let the sealing glide and prevent "pump" effect. When I zoom out , I do it slowly without forcing , and zooming in the same way.
I can do it 200 times, and I never have a single issue. If I want to damage my DFA150-450 I zoom out fast and it's sure way of getting the seals pulled back in the inner rear of the zoom.
That is a design flaw if it can't protect itself against damage from use like that.
10-04-2016, 02:16 PM   #10
Pentaxian




Join Date: Feb 2015
Photos: Albums
Posts: 3,224
QuoteOriginally posted by UncleVanya Quote
That is a design flaw if it can't protect itself against damage from use like that.
Yes, sure, and if so, there should at least be warning / notice issued by Ricoh. That said, if you own a DFA150-450, no need to make it fail. When I sold my apsc Pentax gear, the guy who purchased told me that he was impressed to see all my gear in mint conditions, but some people return camera in "unthinkable state"... He added "For pro who use there gear intensively, I can understand, but for amateurs it's unbelievable that they sometimes return camera full of sand or half broken".
10-05-2016, 07:36 AM - 1 Like   #11
Pentaxian




Join Date: Sep 2008
Location: Phoenix, AZ
Posts: 1,432
Original Poster
QuoteOriginally posted by biz-engineer Quote
That said, if you own a DFA150-450, no need to make it fail..
That's all well and good in theory. So let's try this scenario:

You are a on a 4-5 mile hike with the lens in zoom lock for easier transport because you have a lot ground to cover and wildlife isn't exactly on a schedule.

Suddenly a target appears in the tree 50 feet away from you, you unlock, zoom, focus as fast as you can because birds don't exactly sit still...

You get that picture just as a deer pops it's head out of the undergrowth 10 feet from you. Rack the zoom back to 150 and get that shot too.

True scenario, happened this last weekend on the White Oak trail in Newport News/Yorktown area. Maybe that's what did it, but isn't that why you have a zoom in the first place?

Sounds like the 150-450 is ill suited for this scenario? It's certainly not user negligence as it seems has been inferred.

QuoteOriginally posted by UncleVanya Quote
That is a design flaw if it can't protect itself against damage from use like that.
I'm apt to agree with this conclusion.

Since when is the burden on the photographer to accommodate a lens quirk that runs counter to the very purpose and use of the lens?

QuoteOriginally posted by biz-engineer Quote
"For pro who use there gear intensively, I can understand, but for amateurs it's unbelievable that they sometimes return camera full of sand or half broken".
And so where does one draw THAT line? Am I pro because I make a decent amount every year selling my work for the past 6 years? Or am I an amateur because it's not enough to allow me to quit my day job? I take very good care of my equipment to the best of my abilities, but I'm using my gear in the field and sometime s(&(&t happens. If I'm an amateur does it mean I'm at fault for this issue? If I'm a pro, does it mean Pentax has a design issue?

P.S.

So for what it's worth, B&H is going to take the lens back and repair it for me, which I think is just awesome, especially since Pentax told me sorry, you're on your own because you bought it "used".

So kudos to B&H for taking care of the situation.

Stand by for an update in 4-6 weeks...lol

Last edited by nomadkng; 10-05-2016 at 07:48 AM.
10-05-2016, 08:38 AM   #12
Pentaxian




Join Date: Feb 2015
Photos: Albums
Posts: 3,224
QuoteOriginally posted by nomadkng Quote
And so where does one draw THAT line? Am I pro because I make a decent amount every year selling my work for the past 6 years? Or am I an amateur because it's not enough to allow me to quit my day job? I take very good care of my equipment to the best of my abilities, but I'm using my gear in the field and sometime s(&(&t happens. If I'm an amateur does it mean I'm at fault for this issue? If I'm a pro, does it mean Pentax has a design issue?
Given how many times this issues happened with the DFA150-450, I agree that it is a design flaw and I don't want to blame anyone for bad usage. My point is to highlight what may cause the issue and what may prevent to have to sent it for service. While it is possible to zoon in / out with reasonable speed with the DFA150-450, there is a significant amount of friction so that zooming in / out quickly it counter nature for this zoom. My 2 cents. Of course, if that issue would happen to me, I not be content, I fully understand that.
10-05-2016, 10:19 AM   #13
Moderator
Loyal Site Supporter
BigMackCam's Avatar

Join Date: Mar 2010
Location: North East of England
Posts: 6,245
QuoteOriginally posted by nomadkng Quote
So for what it's worth, B&H is going to take the lens back and repair it for me, which I think is just awesome, especially since Pentax told me sorry, you're on your own because you bought it "used".

So kudos to B&H for taking care of the situation.
That's impressive. It's also the right thing to do, in my view, but certainly beyond B&H's obligations. As you say, kudos to them.
02-02-2017, 09:25 AM   #14
Pentaxian




Join Date: Sep 2008
Location: Phoenix, AZ
Posts: 1,432
Original Poster
QuoteOriginally posted by nomadkng Quote

So for what it's worth, B&H is going to take the lens back and repair it for me, which I think is just awesome, especially since Pentax told me sorry, you're on your own because you bought it "used".

So kudos to B&H for taking care of the situation.

Stand by for an update in 4-6 weeks...lol
Update time:

B&H informed me that the lens was unrepairable. They promptly refunded my purchase price, (yay for them).

Unfortunately, it now really tarnishes the 150-450 reputation in my mind (ie I'm not sure I'll purchase another one).

I have instead opted for a Sigma 300 f2.8 and a 1.4x TC, so we will see how this works. I'm not sure how the whole adding/removing a TC to emulate a zoom will play out. It will be an interesting experiment.
02-09-2017, 06:59 PM   #15
Senior Member
OJGoreng's Avatar

Join Date: Jun 2010
Location: Amsterdam
Photos: Gallery
Posts: 185
QuoteOriginally posted by nomadkng Quote
Update time:

B&H informed me that the lens was unrepairable. They promptly refunded my purchase price, (yay for them)..
Refunding you is good service indeed, but TBH it sounds like they didn't even try... it only took three weeks (drop-off to pick-up; the process required international shipping) to fix the same problem in mine, but even when I dropped it on a concrete floor a year later, repair (including replacement of the front lens group) was still possible (expensive, but possible) and was so well-performed that the lens performs like new.
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!
dfa, pentax service, repair, service, warranty
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Simple lens shootout Pentax HD DFA 150-450 vs Canon 100-400 II vs Sigma 150-600 C beholder3 Pentax SLR Lens Discussion 46 07-25-2016 12:33 AM
DFA 150-450 Price rise Mikesul Pentax SLR Lens Discussion 2 04-03-2016 03:50 PM
DFA 150-450 lens creep gumbee Pentax SLR Lens Discussion 12 03-22-2016 07:53 PM
Nikon D7200+ Sigma 150-600 S vs Pentax DFA 150-450 Shanti Non-Pentax Cameras: Canon, Nikon, etc. 43 12-13-2015 09:02 AM
DFA 150-450 aperture biz-engineer Pentax SLR Lens Discussion 14 06-01-2015 09:42 AM



All times are GMT -7. The time now is 03:38 PM. | 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