CPL Filter use!

Don't leave a cpl on at all times ( or any other filter for that matter but that's personal opinion and sure to provoke a response!). A cpl is a filter to perform a specific role of blocking light from a given direction (hence it rotating) to reduce reflections and ,as a result, increase the blue intensity in skies. it will also block up to 2 stops of light which will drop your shutter speed and probably explains your out of focus shots.

I'd personally recommend just using your lens hood for protection and then filters only when you want the effect they produce.

Cheers
Steve
 
There should be a mark on the rotating ring, this should be turned when, ideally, you are around 90 degrees to the sun. If you look through the viewfinder at the water as you turn it you should see a point where you can see through the water as the reflections will be reduced. Have you checked the exif data from the images, what shutter speed where you getting?

Cheers
Steve
 
Last edited:
Could be one of three things;

- Is it just that the images are not quite as sharp (due to the cheap bit of polarizing glass you have put in front of your lens),
- are they actually out of focus
- are they blurred by camera shake due to lower shutter speed.
 
Not all CPLs have an index mark. No need really, you just rotate it for best effect. Polarisers are all about angles, to the sun and to the sufrace of relections. Need to bone up on that.

But all filters are more likely to degrade sharpness more on longer lenses that magnify imperfections a lot - and cheap polarisers are known culprits. Though the comment about the light loss dropping the shutter speed and possibly inducing movement blur is valid.
 
You must log in or register to reply here.
Back
Top