Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
07-11-2010, 09:29 PM   #16
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
FWIW, the "Best in Class" on the DA*16-50 appears in last month's issue (the "Dive" special) in a roundup. And I note the review you mention does say the Sigma is better in certain areas, but sharpness is conspicuously missing from the list. Once more, I have no experience with or interest in defending the 16-50 - just observing that different people have different opinions. I can't imagine that I'd have anything more to add on this subject.

Last edited by Marc Sabatella; 07-11-2010 at 09:35 PM.
07-12-2010, 04:48 AM   #17
Veteran Member
rparmar's Avatar

Join Date: Jan 2008
Photos: Gallery
Posts: 8,783
QuoteOriginally posted by Marc Sabatella Quote
Once more, I have no experience with or interest in defending the 16-50 - just observing that different people have different opinions.
Of course that is true. I think my "meta point" is that not all opinions are created equal. They must be analysed and evaluated using hard data. And trust, built up over time.
07-12-2010, 05:32 AM   #18
bdery's Avatar

Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,828
MTF evaluates the capability of a lens to create a sharp and "instantaneous" transition between black and white. Nothing more. It is generally also used for general sharpness, but that's simplyfing.

You can beasure almost anything about a lens, honestly. All the aberrations (and I mean, ALL), disrotsion, contrast, sharpness can all be evaluated at the design stage, and verified after assembly.

Don't put too much weigth on MTF. It's an interesting measurement, but not at all the holy grail of lens quality evaluation.

  • 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!
beginners, forum, k-mount, lens, lens reviews, lenses, pentax lens, process, review, reviews, slr lens, thanks
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lens suggestion needed... deathspared Pentax SLR Lens Discussion 18 06-21-2010 03:09 PM
Lens Suggestion cindaaalynnn Pentax SLR Lens Discussion 27 03-24-2009 12:56 PM
Prime lens suggestion ManUtd Pentax SLR Lens Discussion 21 01-15-2009 08:37 PM
Lens suggestion needed... alexeyga Pentax SLR Lens Discussion 10 12-28-2008 01:39 PM
Suggestion for a first lens upgrade andrea_rm Pentax SLR Lens Discussion 3 12-14-2008 03:32 PM

All times are GMT -7. The time now is 04:47 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]