Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-07-2010, 03:34 PM   #1
Pentaxian




Join Date: May 2010
Photos: Albums
Posts: 5,881
Confused on NDF and ring size

I'm a complete novice when it comes to SLR photography and lenses.. Through my online research I've discovered I'll need a NDF to do what I want to do.. now the question.. I look on sites that sell Filters and they all have various sizes - how do I know which to get?

I have a Pentax Kx with only the 18-55mm kit lens for the moment. I see it zooms to 55mm but I don't think I need a 55mm sized NDF.. or do I? I also see a 52mm on it with an icon of a circle with a line through it (Greek Phi??). I'm guessing that is the correct number to look at when matching filter size, but I wanted to confirm before spending money on this stuff.. surely someone here knows the answer. Please pardon my ignorance :c )

05-07-2010, 03:59 PM   #2
Pentaxian




Join Date: Feb 2009
Location: Alameda, CA
Posts: 3,196
The "size" of the filter you want is the "filter thread size" of the lens, not the focal length or focal length range.

In your case, 18-55mm is the focal length range of the zoom lens, and 52mm is its filter thread size.

Short answer: you need a 52mm filter for that lens.
05-07-2010, 04:21 PM - 1 Like   #3
Senior Member




Join Date: Nov 2009
Location: adelaide
Photos: Albums
Posts: 211
Hi mee
the circle with the line is the mathematical abbreviation for Diameter the number is the size eg 49 mil diameter= your filter size when rou purchase your next lens it may have a 55 or 77 diameter so you will need a different filter to fit.
05-07-2010, 06:34 PM   #4
mee
Pentaxian




Join Date: May 2010
Photos: Albums
Posts: 5,881
Original Poster
Thanks guys.. knowing is half the battle... :c D

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!
55mm, camera, ndf, pentax help, photography, size
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
step-up ring vs different size filters math guy Pentax SLR Lens Discussion 8 04-21-2010 09:43 PM
Ok now I think I confused myself. pcfranchina Pentax DSLR Discussion 2 11-26-2007 07:33 PM
16bit, colorspace-1, size-1 -> 8bit, colorspace-2, size-2 deejjjaaaa Digital Processing, Software, and Printing 3 10-09-2007 07:55 AM
Ring flash / ring light for macro tcom Flashes, Lighting, and Studio 5 07-28-2007 10:26 AM
Opinions: Ring light or Ring Flash Peter Zack Flashes, Lighting, and Studio 8 07-14-2007 07:44 PM



All times are GMT -7. The time now is 06:51 PM. | 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