Polarizer filter

Bob Salomon wrote:
In article , Ken Weitzel
wrote:


schuetzen - RKBA! wrote:

;o)-max- wrote:



Get a circular you will be on tha safe side, they work on all
cameras, don't worry, that book has made a mistake.
Which brand, either will do the job fine, there are special
effects polarizers too. ;o)-max-



buy both so that you can tell us which of these guys know what the heck he
is
talking about.
fwiw and just as confused.
chas



...

Hi...

Maybe it would help all of us if I ask about this...

I have a set of Polaroid sunglasses. Maker is Polaroid,
and they're polarized. Wearing them I don't see glare on
the water, and I don't see whatever you call those glare
hot spots (water mirages) on the highway on a real hot
real bright sunny day.

If I take them off and rotate them in front of my eyes
I can watch it slowly reverse. (Instead of no glare, I
see even more glare)

Are these, then, circular?

Ken



No. Circular does not refer to either the shape or the act of rotating
the filter. All polarizing filters are rotated during use to the desired
effect.

A circular polarizer is constructed differently than a linear polarizer.
The circular has a quarter wave plate sandwiched behind the polarizing
foil that allows some light to enter the lens that is circularly
polarized so it can be properly utilized by cameras that utilize a beam
splitter behind the lens to use the metering system, the auto focus
system or to properly display the finder readouts.

Both a linear and a circular polarizer use the same polarizer foil and
perform identically other then the difference in construction. Since
they perform the same purpose the circular can be used on cameras with
or without a beam splitter in the camera. A linear polarizer, however,
will not allow the metering/AF or finder displays to work properly on
those camera systems under all lighting conditions so their use is for
use on cameras without the beam splitter.


Thanks Bob.

That clears it up for me at least

Guess that the clear cut answer then is to patronize
one of our local shops rather than the internet, carry
my camera in with me, ask if I can try one of each in
the store (and out the window)

Take care.

Ken

In article , Ken Weitzel
wrote:

ask if I can try one of each in
the store (and out the window)

No. You simply have to ask the dealer which type is recommended by the
manufacturer. Doing it your way will only tell you both would work under
that lighting condition.

Or ask the manufacturer of your camera.
Or check the instruction book or the list of available accessories for
your camera.

--
To reply no_ HPMarketing Corp.

In article , Phil Stripling
writes
"Sampson" writes:

Phil are you saying that software can do it now and no need for a
polarizer? I have read this is the case from some but have also been
wondering if this is really true.

Sorry, no. It's just a simple question of what problems the original poster
is trying to solve using a polarizer.


He didn't say he had any problems to solve!

--
Jeff Taylor

In article , Jeff Taylor
wrote:

In article , Phil Stripling
writes

Sorry, no. It's just a simple question of what problems the original poster
is trying to solve using a polarizer.


He didn't say he had any problems to solve!

_That_ may be a problem. If he has no problem to solve, what does the
polarizer add to his repertoire? We could all buy starlight twinkle
filters and fog filters, too. If I buy a filter, I expect to have
some problem that this particular filter will solve. (I have a
polarizer, by the way, and it solves the problem for me.)

--
Philip Stripling | email to the replyto address is presumed
Legal Assistance on the Web | spam and read later. email to philip@
http://www.PhilipStripling.com/ | my domain is read daily.

In article , Phil
Stripling writes
In article , Jeff Taylor
wrote:

In article , Phil Stripling
writes

Sorry, no. It's just a simple question of what problems the original poster
is trying to solve using a polarizer.


He didn't say he had any problems to solve!

_That_ may be a problem. If he has no problem to solve, what does the
polarizer add to his repertoire? We could all buy starlight twinkle
filters and fog filters, too. If I buy a filter, I expect to have
some problem that this particular filter will solve. (I have a
polarizer, by the way, and it solves the problem for me.)


I guess it's just down to words :-)
For me, I use my polarizing filter to enhance photos (more saturated
colours).
Not a problem - just adds to the pic

Regards,
--
Jeff Taylor

In article ,
Phil Stripling wrote:

may be a problem

He could just be looking to creatively make something better.

A polarizer can do that by reducing glare, darkening skies, making
clouds whiter, etc.

A star filter can do that by adding an effect to a spectral highlight(s).

A lenticular filter can add eyecatching effects to spectrals.

These are not "problems" that are being solved. They are creative
solutions to improving an image in camera. Some of these effects can
simply not be done in software as quickly, if at all.

--
To reply no_ HPMarketing Corp.