Forgot Password
Pentax Camera Forums Home
 

View Poll Results: Is this DA*16-50mm good or bad?
Keep it -- it's good. 2388.46%
Return it or send it in for repair. 311.54%
Voters: 26. You may not vote on this poll

Reply
Show Printable Version Search this Thread
08-09-2008, 01:24 PM   #796
Site Supporter




Join Date: Jul 2008
Location: Cleveland, OH, USA
Photos: Gallery
Posts: 259
QuoteOriginally posted by dugrant153 Quote
Anyways, I now officially love the DA*16-50, even with a bit of the sticking.
Who is the official? And it's not in your signature?

Just kidding

08-10-2008, 09:43 PM   #797
Forum Member




Join Date: Jul 2008
Location: Longueuil, QC
Photos: Gallery
Posts: 91
QuoteOriginally posted by rfortson Quote
No problems here. When I used the 16-50 on the K10D, I was shocked by some terrible CA if exposure was off. Since then on the K20D, I haven't noticed it, so I think the camera body has an impact.

However, I have taken a few shots on my K20D with the DA*200 that also showed some terrible PF (and I mean fluorescent PF, just horrible). So the K20D isn't immune to PF.
I have a K10D and i want the 16-50 da* too...

What do you mean that terrible CA if exposure was off?? Is it a setting or only a picture with less explosure than needed??
08-12-2008, 03:20 AM   #798
Forum Member




Join Date: Jan 2008
Location: LA
Posts: 74
What should I expect from my DA* 16-50?

Hey everyone,

I'm just trying to figure out what aberrations are "normal" for a *good* 16-50 and what might be indicating a problem. I've just shot a long series of shots at all marked lengths (16, 20, 28, 35, and 50) at 2.8, 5.6, and 11 at three different distances. I'm not posting any pictures (yet) because it'd be alot to do and no one wants to look at 45 images of newsprint. But...

My lens seems to be pretty terrible at 28mm. At 50, I've got decent results even at 2.8. At 16, things are fuzzy in the corners at 2.8, but at 5.6, they look pretty OK. But at 28mm, the corners are a mess at 2.8 and not much better at 5.6. At 20 and at 35, things are as you'd expect, somewhere between the madness of 28mm and the acceptable results of 16 or 50.

"Centering" seems to be fine with the lens, in terms of corners being very similar from corner to corner within a single image. The top right, bottom right, top left, and bottom left corners are equally good and equally bad in each image.

I should add that the center of every image is crystal clear.

So back to the original question: what can I reasonably expect? I'm not wild about what I'm seeing in the corners here at 28mm at most apertures and closer focusing distances. But if that's normal, I guess I'll live with it. If that isn't normal, I need to get in touch with Pentax!

Thanks in advance to everyone that can offer any advice. And I'll be glad to provide examples if anyone cares to look.

Will
08-12-2008, 06:29 AM   #799
Veteran Member
cupic's Avatar

Join Date: Apr 2008
Location: Australia-NSW
Photos: Gallery
Posts: 4,724
A good bang for your buck lenses


cheers

08-12-2008, 07:40 AM   #800
Veteran Member




Join Date: Feb 2008
Location: Toronto
Posts: 3,915
sounds like you got a bad sample, but it'd be better to see photos. perhaps there is a focusing issue as well?

have you looked at the DA* 16-50 thread that's been stickied as well?
08-12-2008, 02:51 PM   #801
Senior Member
Serpiente's Avatar

Join Date: Jul 2008
Posts: 154
mmm I want this lense, but all those issues I begin to doubt!
08-12-2008, 04:15 PM   #802
Veteran Member
PentaxPoke's Avatar

Join Date: Jan 2008
Location: Oklahoma
Posts: 1,411
My DA* 16-50 saga. chapter II

Hi again folks. Well some here may have read my thread some time ago about how a new DA*16-50 I bought was decentered. In other words, in all the pictures, the right side of the image was out of focus. I sent that one back to Amazon and got a full refund.

So I waited a couple of months, and decided to give the 16-50 another chance. This time I bought a new one from B&H. I received it less than a week ago, and started snapping away like mad. To my dismay, now it wasn't just the right side out of focus, the left side was out of focus as well! The center was very sharp. Wishfully thinking to myself, I thought "maybe this is just because I am taking shots at f/2.8 and it is soft around the edges." Well, to my further dismay, the softness happened at all apertures and all focal lengths! This is not "pixel peeping" either. You can see the problem even without looking at 100% crops! The center was very sharp but as you move towards the edges it is very noticeable. It is not my camera either because none of my other lenses listed in my signature had this problem. For example, the sharpness of my 18-250 at the edges in comparison, made the 16-50 look like I was taking pictures through a Coke bottle (I exaggerate).

Luckily, B&H has a great return policy, and they pay for shipping. I am giving this one more chance: if the 16-50 I get back this third time is defective, I must end this quest.
08-12-2008, 05:16 PM   #803
Senior Member
hinckc's Avatar

Join Date: Apr 2007
Location: New Jersey, USA
Photos: Gallery
Posts: 298
Hi PentaxPoke,

Too bad you've had to go through all that.

One thing I was thinking as you described your new (well, 2nd) lens was that maybe the AF was front or back focusing. That would yield a completely OOF shot like you described.

Was it any better or worse with your K20 than your K10? Did you try MF?

I sure love mine. I've used it on my K100D, K10D, and K20D, with success across the board.
But I never did one of these tests that everyone does. I really need to try a brick wall to see what mine delivers....

Best of luck!

-Chris

08-12-2008, 05:34 PM   #804
Loyal Site Supporter




Join Date: Sep 2006
Location: Bronx NY
Photos: Gallery | Albums
Posts: 5,599
Sorry to hear about your woes PP, but you've got my admiration for patience and tenacity! After two bad copies of the much ballyhooed FA* 24mm I gave up. It's stories like yours that keeps me away from this lens. I can however recommend the Sigma 17-70. It's not weather sealed and doesn't have SDM, on the other hand it also doesn't have decentered or other QA issues.

NaCl(but the third's the charm, so they say)H2O
08-12-2008, 05:44 PM   #805
Senior Member
Serpiente's Avatar

Join Date: Jul 2008
Posts: 154
is Pentax working on it? I think their testing isnt optimal
08-12-2008, 09:03 PM   #806
Veteran Member
PentaxPoke's Avatar

Join Date: Jan 2008
Location: Oklahoma
Posts: 1,411
Chris,

I don't think it was FF or BF. The center of the images were always very sharp. I have no complaints about focus speed or accuracy on the lens. I would just like to get one that actually can focus across the entire field of view!

Here is an example of how bad it is. I am saving bandwidth on this site, so trust me that both pictures are very sharp in the center. These are just crops of the edge of the frame. In the Tamron 17-50 shot, it is at the absolute edge. In the DA*16-50 shot, the crop is not even to the edge of the frame! (Can you guess which one is the DA*?)
Attached Images
   

Last edited by PentaxPoke; 08-12-2008 at 09:20 PM.
08-12-2008, 09:32 PM   #807
Veteran Member
PentaxPoke's Avatar

Join Date: Jan 2008
Location: Oklahoma
Posts: 1,411
Will,
How do your images compare to the ones I posted here:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/34507-my-da-16...hapter-ii.html

I compared my (second) DA*16-50 to my Tamron 17-50 as well as my 18-250 (not shown). Not only was the lens worse than the other two, it was worse than a P&S camera I used to take the same picture! The center of each image was very sharp, but the edges were terrible at all focal lengths and apertures I tested. Needless to say, I sent the lens back, and I will be on my third one...
08-12-2008, 10:39 PM   #808
Senior Member
hinckc's Avatar

Join Date: Apr 2007
Location: New Jersey, USA
Photos: Gallery
Posts: 298
Hi PentaxPoke,

Sadly, I see what you mean -- Guessing the 16-50 was on the right... It's not even just OOF, it looks stretched or "nervous"....

Just trying to cover all the bases....

It's just that..... I tried 2. One at my local shop, and one at B&H, and both were beautiful.... It's not that I don't believe so many are bad, it's just that I have a hard time believing it. I'm just glad I'm as lucky as I am!!!

I really hope that 3 is a charm for you, as Salty said...

I'll try to get a shot of the "wall" before the weekend's here... At least so there's a comparison...

-Chris
08-13-2008, 03:11 AM   #809
Forum Member




Join Date: Jan 2008
Location: LA
Posts: 74
Poke,

Wow. Nowhere near as bad as that. See, this has me wondering if I'm being paranoid or not. I've never purchased a lens that had QC problems before, so I've never felt the need to shoot a newspaper test before. The whole affair has me wondering if what I see in the corners is normal for such a complex zoom or not.

Then I look at my pictures again. While I can certainly say that I don't have the problems you had, I can also say that what I'm seeing in the corners at 28mm/2.8 is really, really bad.

Will
08-13-2008, 03:52 AM   #810
Veteran Member




Join Date: Sep 2007
Location: NOLA
Posts: 396
Just because I am sort of tired of posts with crappy test shots, here is what you can really expect of your DA 16-50mm

All you need is Sebastian MySpace.com - SebastiAn - FR - www.myspace.com/0sebastian0 on stage
3000 rocking kids
a K20D set at 800 iso 1/8 s and your 16-50mm at 2.8.
No Lightroom tricks of any kind.

Press button and:



Copyrighted material
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!
k-mount, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question to K-5 Owners kevinschoenmakers Pentax K-5 3 10-19-2010 06:40 PM
Question for K-X owners. dimebagdave Pentax DSLR Discussion 6 04-29-2010 05:17 AM
PZ-1P question(for owners) LongLiveVelvia Pentax Film SLR Discussion 3 10-09-2009 10:51 AM
A question for K7 owners dafiryde Pentax DSLR Discussion 26 09-05-2009 02:52 AM
Question for FA 28-70/4 owners Ivan Glisin Pentax SLR Lens Discussion 8 08-13-2007 01:08 PM



All times are GMT -7. The time now is 05:44 PM. | See also: NikonForums.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