Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
12-20-2011, 03:19 AM   #1
Jonathan Mac's Avatar

Join Date: Apr 2009
Location: Madrid, Spain
Posts: 4,428
DA 35mm macro stationary element

I just noticed something weird. Unlike every other (non internal focusing) lens that I own, the DA 35mm macro ltd has a stationary rear element that does not move with the other optics when focus is changed. I'm intrigued.

Why is this? Is it because it's a macro lens? Does this bring any benefits to the optical design?

12-20-2011, 05:16 AM   #2
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,401
This is a Fixed Rear Element design like the old K28/2. The fixed rear element is part of the focusing design which results in a reduction in focal length when focusing in close, this is a benefit to a macro to keep it small, but it means that the working distance would be shorter for any magnification ration than a true 35mm. You can test the lens to see the reduction in focal length as you get close

  • 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!
da, da 35mm macro, element, k-mount, lens, macro, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
7 element super takumar vs 8 element 50 1,4 fikkser Pentax SLR Lens Discussion 3 07-13-2013 07:59 AM
O-GPS1 - How is this works with moving + stationary object? LFLee Pentax Camera and Field Accessories 12 09-30-2011 12:42 PM
8 element vs 7 element 50mm f1.4 RMJ Troubleshooting and Beginner Help 8 09-19-2011 12:11 PM
For Sale - Sold: DA 35mm/2.8 Macro Ltd, FA 50mm, DA L55-300mm, Pentax Macro Bellow Unite I (US) yurko_yr Sold Items 10 03-16-2011 07:09 PM
Damaged rear lens element on F70-210, can the element be replaced? WendyB Pentax SLR Lens Discussion 13 01-05-2008 08:41 AM

All times are GMT -7. The time now is 11:54 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]