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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

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02-12-2008, 12:45 PM   #391
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Thanks for your help guys. I would have to ship the lens/camera to pentax. I'll try the focus test tomorrow as well.

02-12-2008, 12:50 PM   #392
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It's not a flat field lens and it will never look good on 2D target. If both sides are equally blurry or sharp, the lens should be good. Just use it for normal subjects and you will be a much happier man.
02-12-2008, 08:22 PM   #393
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Which is EXACTLY why it's best to phptograph a newspaper!


QuoteOriginally posted by Gooshin Quote
the wall might not be fully parralel to the camera

the softness could simply be OOF depending on where you focused.
02-13-2008, 07:48 AM   #394
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QuoteOriginally posted by drivel Quote
You're right, but it's out of focus about equal amounts in each corner. I'll post some more at 16mm stopped down in a bit.



Here are some at 50mm f8

Whole image:



100 %Crops of

Center:



Top Right:



Bottom Right:




Top Left:




Bottom Left:



Thanks again!
Certainly appears that the left side images are not nearly as sharp as the right side images. This could of course be due to sensor not being parallel to the subject or due to centering defect. I found it helpful to compare my * lens to my kit lens at identical focal length/aperture combinations. My kit lens, which never had any problems, showed consistent sharpness across the newspaper, while my * lens showed obvious poor sharpness on left side of all images.

Ted

02-13-2008, 10:24 PM   #395
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DA* 16-50mm

Are they safe to buy yet? I was thinking of getting the DA 14mm because it seems to produce nice images and is fast at f2.8 but for a little bit more I can get the DA* I think it might be worth it, that is if it is past the quality control issues.
02-13-2008, 10:28 PM   #396
and
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I would visit a store and test it thoroughly there... I dont think there is any guarantee that the copies out there are all good. I have seen some not very impressive shots from sub par copies of this lens and some very good ones from good copies (codiacs copy seems very good)
02-13-2008, 11:02 PM   #397
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I agree with And- go to the store and 'try before you buy'.
02-14-2008, 12:11 AM   #398
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QuoteOriginally posted by and Quote
I would visit a store and test it thoroughly there... I dont think there is any guarantee that the copies out there are all good. I have seen some not very impressive shots from sub par copies of this lens and some very good ones from good copies (codiacs copy seems very good)

agreed--- there may be very few bad ones, but they keep getting recycled I suspect so a 100 folks have beenburned by the same 10 lenses.

02-14-2008, 12:19 AM   #399
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QuoteOriginally posted by rvannatta Quote
agreed--- there may be very few bad ones, but they keep getting recycled I suspect so a 100 folks have beenburned by the same 10 lenses.
Someone should start a database/thread of the serial #'s of bad copies so that if someone buys one they can check it against the known uglies...
02-14-2008, 02:53 AM   #400
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That's no a bad idea with the SN's

This is one lens, I'd never try to save a few buck with online. Some guy on Ebay just dumped one and before the end, I emailed him since he guaranteed the lens was fine. So his response was that his gear worked great but if there was a FF/BF issue he would not take it back under any circumstances. Sorry no deal!
02-14-2008, 05:48 AM   #401
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QuoteOriginally posted by and Quote
I would visit a store and test it thoroughly there... I dont think there is any guarantee that the copies out there are all good. I have seen some not very impressive shots from sub par copies of this lens and some very good ones from good copies (codiacs copy seems very good)
I agree. If you have the luxury of trying out the DA* 16-50 hands-on before purchase, that is the way I would do it. Otherwise you are buying a $700+ lottery ticket.

Ted
02-14-2008, 05:50 AM   #402
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Is there a good easy test to try in store to see if it's a dud? I'm going to try one out this weekend if they have it in stock.
02-14-2008, 07:17 AM   #403
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No store within 100 miles of here has any Pentax gear in stock, it sucks. Unless things have changed over the past few months. Maybe I will venture out today and see what I can find. If not, I have a plan B already in the works.
02-14-2008, 07:31 AM   #404
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QuoteOriginally posted by Buddha Jones Quote
No store within 100 miles of here has any Pentax gear in stock, it sucks.
Same here. So I have to rely on online retailers and these forums.

But you guys are scaring me right now. Mine is 'out for delivery' at this moment. I hope it's a good one. Probably won't have time to try it out until this evening. Keeping fingers crossed.
02-14-2008, 08:39 AM   #405
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If I were in a store I would check if it is able to focus correctly at 16mm f2.8.
E.g. lay a catalog on the table, a pencil next to it and focus on the pencil.
Distance about 30 cm. Try to use daylight.
Check the small script on the catalog next to the pencil, if it is focussed accurately, or if there is back- or frontfocus.
Then repeat this at 50 mm.
If both are ok, the you probably got a good one.
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