Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-16-2011, 08:38 AM   #1
Junior Member
petetax's Avatar

Join Date: Dec 2009
Location: Devon
Photos: Gallery
Posts: 40
Fader ND filter

I've just seen a couple of adverts for these gadgets.
Seems that they are made up of two polarising glass sheets that are rotated to give variable 'density'.
Has any body any experience of these, i.e.
easy of use?
quality of resulting images?
problem like vignetting?
or other thoughts.

Just seems one of these could be cheaper than several fixed ND filters

02-16-2011, 10:32 AM   #2
Pentaxian
panoguy's Avatar

Join Date: Sep 2007
Location: Washington, D.C.
Photos: Gallery | Albums
Posts: 3,304
I have 77mm and 67mm versions of these:
Filter > Fader ND mark II -

They work quite well for ND filtering (more neutral than my Cokin NDs!), and are easy to use (like any round filter), and easier than stacking NDs because you can set up the shot through the viewfinder at the lowest ND amount, then dial it up to visual blackness for your long exposure without needing to add/remove anything. The LCW ones are wider at the front to minimize vignetting on wide-angle lenses, so they come with their own lens cap.

The image quality from the "LCW Mark 2" versions is great on my 12-24 and 50-135. Singh-Ray also makes a very good filter like this called the Vari-N-Duo. Apparently the longer the lens, the more critical the "flatness" of the filter becomes, and when you sandwich two polarizers together... well, some cheaper "me-too brand" filters are not very flat and cause blurriness.

One thing that all variable-ND filters like these have in common is that if you rotate beyond the marked scales for ND filtering, you will enter the point where the two polarizers "match up" and it causes a big, blurry dark "X" in your frame. Some folks who don't read the instructions think the filter is defective, so fair warning!

EDIT: Here's a shot from last summer with the 12-24 and LCW ND (2 sec. at f/11). The sunlight was quite bright, so I had to accept some blown out rocks with the motion-blur.


Last edited by panoguy; 02-16-2011 at 10:59 AM.
02-16-2011, 11:09 AM   #3
Inactive Account




Join Date: Dec 2008
Location: Ames, Iowa, USA
Photos: Albums
Posts: 2,965
Even home-made versions work well. If common polarizers are used there will likely be tinting as you approach complete extinction. That doesn't matter if you just avoid complete extinction.

Stack a linear or reversed circular polarizer on a circular polarizer. Here's an example with at least 8 usable ND stops...
02-17-2011, 07:22 PM   #4
Veteran Member
alohadave's Avatar

Join Date: Jan 2008
Location: Quincy, MA
Photos: Gallery | Albums
Posts: 2,024
Read through this: https://www.pentaxforums.com/forums/pentax-camera-field-accessories/89051-neu...ilter-faq.html

There are some issues to this type of filter.

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!
camera, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Variable ND Filter - Fader ND mark II yusuf Pentax SLR Lens Discussion 2 11-16-2010 11:39 AM
For Sale - Sold: Sigma 17-70mm and 67mm LCW Fader ND filter (Worldwide) panoguy Sold Items 4 07-07-2010 06:18 AM
full manual control with fader ND? karl79 Video and Pentax HDSLRs 3 02-16-2010 10:53 AM
For Sale - Sold: Pentax and Albinar 2x TCs, 2 Cokin A filter sets, 49mm Filter and Macro tubes pxpaulx Sold Items 15 02-11-2010 09:09 PM



All times are GMT -7. The time now is 11:25 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