Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-06-2008, 04:15 AM   #1
New Member
Buutopia's Avatar

Join Date: May 2007
Location: Berkeley CA, USA
Posts: 4
DA* 16-50mm owners Please advise

I'm looking into getting purchasing a DA* 16-50mm. I've been reading post on this forum and it seems as if you get very good results when you get a good instance of the lens and not so great when you get a bad copy. I also heard that the later samples have less of a problem. So here are my two questions. Is the back focusing issue fixed in the newer copies? and can the owners of this lens please post the first few numbers of the serial numbers of your copy and whether you think that it is a good copy or a bad copy? thanks.

01-06-2008, 04:47 AM   #2
Veteran Member
roentarre's Avatar

Join Date: Oct 2006
Location: Melbourne, Australia
Posts: 11,794
As long as the lens is not decentred, the lens does pretty well. Nothing to do with serial numbers and it is probably to do with luck.

I guess my Buddha had protected me from getting the bad copies for last few purchases (Stephen tested this copy for me while I got it from him in the market place here)

I had posted numerous shots in post your photo section already.

Here are a few examples...










Check out my site for some of the sample shots here - altogether 56 images. Just pick Da* 16-50 in the drop down menu.

James Wei :: Photography




If you like the lens, go for it.
01-06-2008, 06:00 AM   #3
Veteran Member
PePe's Avatar

Join Date: Nov 2007
Location: Helsinki, Finland
Photos: Gallery | Albums
Posts: 456
It is not really clear to me what the linkage between these quality issues and production runs is. I bought mine in September, the serial number is 901XXXX, and it is definitely one of the good ones.
01-06-2008, 09:15 AM   #4
Veteran Member




Join Date: Aug 2007
Photos: Gallery
Posts: 1,563
After all the alarming messages on the DA*16-50, I've taken a number of test shots with my 18-55, 16-50 and 18-250 this afternoon.

Subject: the brick wall of our house.
Distance 50cm, all lenses wide open (f3.5, f 2.8, f3.5, at 18mm, 16mm, 18mm, ISO 100)

I've looked at them 50 times over and my conclusion is:

There is no clear winner for me.

The DA* center sharpness is best (not stopped down to get equiv f 3.5!)
Tamron 18-250 comes in at close second.

Cornersharpness of the Tamron is the best.
The DA* is less than the Tamron, comparable with the kitlens.
However, it is comparing 16mm with 18mm and f2.8 with f3.5!

Barrel distorion of the DA* is less than the Tamron, also vignetting is somewhat less.
I cannot see a lot of difference in colourshifting in the corners between the lenses.

Overall: the DA* 16-50 at 16mm f2.8 does not give me extra IQ.
I did not do these test with the DA* stopped at f3.5 and 18mm. IQ should improve...

The DA* advantages are: apperture (f2.8), weather sealing, 16mm vs 18mm and SDM.
The disadvantages are: weigth, size and price.
If that is worth the money, depends on how deep your pockets are I guess.

- Bert

01-06-2008, 09:44 AM   #5
Loyal Site Supporter




Join Date: Sep 2006
Location: Bronx NY
Photos: Gallery | Albums
Posts: 5,607
QuoteOriginally posted by bymy141 Quote
After all the alarming messages on the DA*16-50, I've taken a number of test shots with my 18-55, 16-50 and 18-250 this afternoon.

Subject: the brick wall of our house.
Distance 50cm, all lenses wide open (f3.5, f 2.8, f3.5, at 18mm, 16mm, 18mm, ISO 100)

I've looked at them 50 times over and my conclusion is:

There is no clear winner for me.

The DA* center sharpness is best (not stopped down to get equiv f 3.5!)
Tamron 18-250 comes in at close second.

Cornersharpness of the Tamron is the best.
The DA* is less than the Tamron, comparable with the kitlens.
However, it is comparing 16mm with 18mm and f2.8 with f3.5!

Barrel distorion of the DA* is less than the Tamron, also vignetting is somewhat less.
I cannot see a lot of difference in colourshifting in the corners between the lenses.

Overall: the DA* 16-50 at 16mm f2.8 does not give me extra IQ.
I did not do these test with the DA* stopped at f3.5 and 18mm. IQ should improve...

The DA* advantages are: apperture (f2.8), weather sealing, 16mm vs 18mm and SDM.
The disadvantages are: weigth, size and price.
If that is worth the money, depends on how deep your pockets are I guess.

- Bert
Thanks Bert for all that work. It sure helps me (and I assume others) in making a decision about this lens

NaCl (the production QA issues are still troublesome tho)H2O
01-06-2008, 11:23 AM   #6
New Member




Join Date: Feb 2007
Location: near Muenster/Germany
Posts: 8
16-50 works great

thats today the problem to get a good working piece!
Mine is realy great, very sharp, no problems with front- or backfocus. Its absolutely new out of the newest production.
You should try the lens at your dealer!
01-06-2008, 02:29 PM   #7
Site Supporter
Fl_Gulfer's Avatar

Join Date: Jul 2007
Location: Florida Gulfer
Photos: Albums
Posts: 3,049
Thanks Bert::: It just shows, for the price the Tamron is a great lens. I was going to get the 16-50 but when I started reading about the 2 lenses. I just couldn't resist the Tamron. Thanks for conferming what I thought.
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!
16-50mm, copy, da*, k-mount, lens, owners, pentax lens, post, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Trouble with SMC F 50mm 1.7, request to F and FA owners tr13 Pentax SLR Lens Discussion 5 09-08-2009 11:53 PM
Suggestion for Sigma 24-70 owners (or potential owners) joeyc Pentax SLR Lens Discussion 4 08-07-2009 03:12 AM
Request for limited owners and K7 owners Psynema Pentax SLR Lens Discussion 0 07-09-2009 07:11 PM
Question for 16-50mm owners Itzik Pentax SLR Lens Discussion 1099 01-08-2009 10:38 PM
Lens Advise please Murphy2004 Pentax SLR Lens Discussion 4 10-21-2008 06:06 PM



All times are GMT -7. The time now is 03:24 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