My new Hoya super thin 67mm circ. polarizer

[fevbusch]

  I just received my polarizer and it screwed onto my DA 16-45 lens beautifully, and I have no problem
  moving it around even with lens hood on (with the little window open).
      When I had a (cheaper) hoya circ. polarizer on my DA 50-200, the shifts in color and light and dark were very dramatic.  However, with the 16-45 they seem to be very subtle differences.  Is this normal and why
  can't I make extreme changes in the filtering.    Freddy

[tcom]

The effect of a polarizer depends on a lot of things.

When there is a lot of dust in the air, the effect is reduced. Once in Egypt, a few days after a sandstorm, I could turn a polarizer like I wanted, I could not see any effect.

It depends also on the angle to the sunlight. You need to remember that the effect is stronger when you have the sun at right angle on either side. It will be less visible with the sun in your back and almost non-existant with the sun in front.

[fevbusch]

 Thanks, Dominique.  I tried it from my terrace which might have been part of my problem.  Also,
 It was kind of overcast so that may have interfered.  Then I thought of shooting reflective surfaces
 like leaves on plants and windows on cars and then did see the effects of the polarizer.
   I'll get out there on a sunny day and give it a workout.  I heard so many complaints about how
  they get stuck on threads and are hard to manipulate.  I have no trouble at all with it.  It works
  very nicely when I open the little window on the lens hood. That may also be due to the high quality of this Pentax 16-45 lens.  Smooth as butter.  Talk to you later.    Freddy

[tcom]

The only thing were you do need to pay attention in regards of stuck filters, is not to stack filters. Do not mount the polarizer on top of a UV filter, it could get difficult to separate them.

[fevbusch]

 No, I would never do that.  I wouldn't want to lose any stops.  This thin filter will be fine on its own.
  Thanks again,    Freddy