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07-01-2009, 10:53 AM   #361
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Got mine today. SN9022551. Seems OK. Not as sharp (a quick try @ 50/f4) as my A50/1.4. But then, what is? I'll shoot some more and report back if anything is wrong.

07-01-2009, 12:39 PM   #362
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Here's an image. Not quite sure yet...

07-09-2009, 11:59 AM   #363
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Got mine a couple of weeks ago #9029850 and the shots are sharp, clear all I can say is Wow...
07-10-2009, 10:21 AM   #364
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Tentatively good copy 9032xxx purchased one week ago from B&H New York store.

07-15-2009, 07:31 PM   #365
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9030722 : Not bad, but not what I had hoped for from this lens - the 50-135 makes it look particularly bad. Exchange (Amazon) for 9028971 - like night and day. The second unit is stunningly sharp throughout the zoom, with excellent center sharpness (slightly soft corners) wide open at either end.
07-15-2009, 09:10 PM   #366
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9027725. Was usable on the K20D, although seemed somewhat soft even with -7 AF correction. On the K-7, lens front focuses even with -10 AF correction. Sent back to Pentax for repair. We'll see how it turns out...
07-16-2009, 01:00 PM   #367
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I have always wondered how this thread kept getting posted to so long after the fact. Now I see... I will be sending my copy in for service after the aperature got stuck on me in NY.
07-16-2009, 07:30 PM   #368
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I have one showing up tomorrow from Amazon. Hopefully it'll be close to my 50-135* in performance. I had one a year or so ago that wasn't very good, took it back to my local store and swapped it for a 16-45 and some other stuff.

07-17-2009, 12:20 PM   #369
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QuoteOriginally posted by Buddha Jones Quote
I have always wondered how this thread kept getting posted to so long after the fact. Now I see... I will be sending my copy in for service after the aperature got stuck on me in NY.
Sorry to hear that. Yet another victim of the Sometimes Doesn't Move syndrome of the DA*'s
07-17-2009, 04:07 PM   #370
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So far so good. There is vignetting at 2.8 but that is to be expected. It also is a tad soft on the edges at 2.8 but is pretty damn sharp in the center. Stopping down to 4.0 makes a significant difference and above that there is no vignetting.

I've always regarded the 16-45 as an incredible lens for the money. I shot the 16-50* back to back with the 16-45 and the 16-45 is still the value leader. But I have to say that at 16mm with both at f4.0 the 16-50* was sharper than the 16-45.

Now I'm thinking K20d w/16-50* and 50-135* as the "do everything" setup and get a K7 with 15/31/35/43/77 as the "street/prime" setup.

Now I just need another $2K
07-18-2009, 02:48 PM   #371
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nostatic, are you sure that the f-stop is the cause of your vignetting
that's usually caused by something at the front of the lens, like a hood, or even a filter.
And usually only at the wide end.
so if your lens has vignetting it should only ocure at the 16 - 18mm range or so, and it shouldn't mater what f-stop your using.
07-20-2009, 09:30 PM   #372
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QuoteOriginally posted by little laker Quote
nostatic, are you sure that the f-stop is the cause of your vignetting
that's usually caused by something at the front of the lens, like a hood, or even a filter.
And usually only at the wide end.
so if your lens has vignetting it should only ocure at the 16 - 18mm range or so, and it shouldn't mater what f-stop your using.
You tell me.

At 50mm

f2.8


f5



f2.8


f5.6
07-20-2009, 11:13 PM   #373
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QuoteOriginally posted by nostatic Quote
You tell me.

At 50mm

f2.8


f5



f2.8


f5.6
Your right, it sure looks like vignetting at 50mm to me
I wonder if anyone else has that happening. I've never seen that occur while a lens is zoomed out
07-21-2009, 11:52 PM   #374
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Here's what photozone found regarding vignetting:


As you can see, vignetting occurs both at the wide end and long end, and less so in the middle range.

Also, not sure what you mean by it shouldn't depend on f-stop, all lenses have worse vignetting wide open.
07-29-2009, 01:17 PM   #375
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Just a quick one.
I've been looking at this lens for a while now, and I'm aware of the problems it has had. But since I got my 50-135 I'm really tempted to get it's shorter brother (and one longer in long run). Looking at this thread, there is 26 pages here. Has anybody tried to put down the ranges of good and bad lenses?
simplyfied 1 - 200 good 201 - 244 bad 245 - ... good...
etc?
Or will I have to that to find out..

BR
Peter
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