Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-30-2010, 08:16 PM   #1
Veteran Member

Join Date: Nov 2007
Location: Ottawa
Photos: Gallery
Posts: 477
Why DA 17-70/F4 has no ED glass?

Recently thinking replace my kit lens to 17-70. As I know, all SDM lenses using ED glass for better color rendering except this one.

Anyone has idea? Thanks

05-30-2010, 08:31 PM   #2
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Photos: Albums
Posts: 10,733
Perhaps because they were able to get the image quality they needed without reverting to ED glass.
I used the 17-70 for a few days just after it's release and found no issues with it's colour rendering, nor have I heard of any complaints with the way it renders colour.
I believe ED glass is used primarily to help control certain optical aberrations, and has little, if anything, to do with colour rending.

  • 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
Through the looking glass albatross Monthly Photo Contests 2 02-01-2010 01:43 PM
Glass is glass right?? Raptorman Pentax SLR Lens Discussion 15 11-11-2009 01:56 PM
Through the Looking Glass benisona Monthly Photo Contests 0 10-06-2009 02:43 PM
Pentax glass versus 3rd Party Glass??? rdrum76 Pentax SLR Lens Discussion 1 11-04-2007 04:02 PM
Autumn colors - old glass is a good glass andrei46 Post Your Photos! 5 10-26-2007 09:35 AM

All times are GMT -7. The time now is 07:55 PM. | 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]