Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
11-11-2010, 06:53 PM   #1
New Member

Join Date: Jun 2010
Posts: 15
Filter size for 21mm f3.2 -- 43 or 49?

I am buying a 21mm f3.2 and the pentax site says it accepts 43 or 49 mm filters. Can anyone with experience with this lens please explain how this lens can use either size, and please comment on which you prefer. Many thanks,

11-11-2010, 07:01 PM   #2
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 42,391
The unadapted filter diameter is in fact 49mm: SMC Pentax-DA 21mm F3.2 Limited Lens Reviews - Pentax Lens Review Database

So that's what you want to get. AFAIK, there are no K-mount Pentax lenses with a smaller native thread. It's also the most common filter size for Pentax lenses.

I think that with the hood you can use 43mm filters.

Adam Webmaster (Site Usage Guide | Site Help | My Photography)'s high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

11-11-2010, 07:08 PM   #3
twitch's Avatar

Join Date: Nov 2009
Posts: 4,571
The DA21 can take both sizes, however with a 49mm filter the hood cannot be used, with a 43mm filter the hood can be used. The 43mm filter screws in under the hood, the 49mm blocks the hood.

Which size to buy then depends on whether you need to use the hood or not. If you don't care about using a hood, buy the 49mm, if you do then you have no choice but to buy a 43mm.

  • 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!
21mm, 21mm f3.2, f3.2, filter size, k-mount, lens, pentax lens, size, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
10-17mm filter size? timstone Pentax SLR Lens Discussion 5 04-06-2010 06:07 PM
Size of k100D Hot Filter? Avantphoto Pentax DSLR Discussion 2 07-21-2008 01:56 PM
filter size please BARCUD Pentax SLR Lens Discussion 8 07-21-2008 07:35 AM
What is your filter size policy? zorobabel Pentax Camera and Field Accessories 4 05-07-2008 12:33 AM
Help with Filter size Please! Jennifer Pentax SLR Lens Discussion 10 03-03-2007 10:00 PM

All times are GMT -7. The time now is 06:50 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]