How not to use a Circular Polarizing Lens (Page 5): It worked! I rotated the CPL and my laptop screen went totally black. How do I get it back so I can read it again???

Golan Loc: Imsbach, Germany

jcboy3 wrote:

You must be thinking of a variable neutral density... (show quote)

It worked! I rotated the CPL and my laptop screen went totally black. How do I get it back so I can read it again???

jcboy3

Armadillo wrote:

jcboy3, br br A very interesting discussion on te... (show quote)

I was speaking of the glass element; obviously there are two rings, one to attach to the lens and one that holds the glass element and rotates.

I cannot recall ever seeing a CPL with two glass elements. I'll take everyone's word that there is, but don't know what the second glass element would be doing. I thought that the linear polarizer and 1/4 wave retarder had to be aligned. If not, then maybe each of these is a single glass element.

If the CPL blacks the screen both when facing towards and away from the screen, then maybe there is another wave retarder in the mix? Or the filter is not a CPL. A Linear Polarizing filter will block both ways.

brittainsas1 Loc: Laytonsville, Md.

jerryc41 wrote:

Are you baiting us or just fishing for a compliment? Casting about for a compliment? Maybe you're trying to lure us away from the main topic at hand. Trying to get chummy? At least you don't seem to be trolling, but no one here is taking the bait.

Oh my cod, Jerry took the bait....and floundered with it. :-) Nope, I wasn't trying to mussel in , or be a pain in the bass on the topic of polarizers and fish, as it was way too deep for me.......... but I shore was tempted. If it's caused anyone any misery, please let minnow.

Nikonian72 Loc: Chico CA

Searcher wrote:

so a Circular Polarizing Lens is actually a Circular Polarizing Lens Filter? (CPL filter)

The article that you cited proves my point: the terms Polarizing Lens, Circular Polarizing Lens, nor CPL are ever used to describe a Circular Polarizing Filter.

Most of the points covered previously are mentioned here:
FAQ: Which Photographic Filters for Digital Photography?
http://www.uglyhedgehog.com/t-26502-1.html

Tracy B. Loc: Indiana

I tried to stop reading these slimy posts, but I'm hooked.

brittainsas1 Loc: Laytonsville, Md.

Tracy B. wrote:

I tried to stop reading these slimy posts, but I'm hooked.

Oh bouy, You should be docked for that ! What I sea, is a really biting remark here ! So water you really mean by that ? I hake to say it, but it's time that Tracy B. get's put in the punitentiary as well !

Leitz Loc: Solms

Nikonian72 wrote:

The article that you cited proves my point: the terms Polarizing Lens, Circular Polarizing Lens, nor CPL are ever used to describe a Circular Polarizing Filter.

Most of the points covered previously are mentioned here:
FAQ: Which Photographic Filters for Digital Photography?
http://www.uglyhedgehog.com/t-26502-1.html

Indeed, one must be cautious to use the correct nomenclature. I called my electric torch a flashlight, and now the batteries are all corroded!

LFingar Loc: Claverack, NY

Never paid any attention to the construction of my CPL's. Always assumed they consisted of two pieces of glass, a static and a rotating. After reading some of these comments I checked mine. Hoya HD2 Cir-Pl. Sure enough, they consist of only one piece of glass. I learned something! My day has not been a total waste!

Bram boy Loc: Vancouver Island B.C. Canada

Tracy B. wrote:

I tried to stop reading these slimy posts, but I'm hooked.

The word is Not slimy posts , it's more like drivel

LFingar Loc: Claverack, NY

Leitz wrote:

Indeed, one must be cautious to use the correct nomenclature. I called my electric torch a flashlight, and now the batteries are all corroded!

Now, if you lived on this side of the pond your batteries would we fine. We use flashlights for light and electric torches for cutting steel and other metals! :-D

josephnl Loc: Irvine,, CA

teesquare wrote:

ANY piece of glass - which light passes thru - and has ANYTHING to do with focusing, filtering or altering the light in ANY way...is a lens. Such as a simple magnifier. Or your glasses that you wear.
Are they filters, or lenses...or both?

At least - that is the layman's explanation - and in accord with the normal explanations I have always understood.

So...'splain it to me - would please?

Not quite. Having studied optics, I can tell you that the generally accepted definition of a lens includes the bending of light rays resulting in either convergence or divergence of the rays.

Webster's definition is:
"a piece of transparent substance, usually glass, having two opposite surfaces either both curved or one curved and one plane, used in an optical device in changing the convergence of light rays, as for magnification, or in correcting defects of vision"

Most would not consider a filter to be a lens.

Leitz Loc: Solms

LFingar wrote:

Now, if you lived on this side of the pond your batteries would we fine. We use flashlights for light and electric torches for cutting steel and other metals! :-D

I cannot part with my motor car, and would have to ship it over. I cringe at the thought of someone calling my beloved Hillman an automobile! :lol:

Ralloh Loc: Ohio

LFingar wrote:

Never paid any attention to the construction of my CPL's. Always assumed they consisted of two pieces of glass, a static and a rotating. After reading some of these comments I checked mine. Hoya HD2 Cir-Pl. Sure enough, they consist of only one piece of glass. I learned something! My day has not been a total waste!

I learned something today too. But whether some call it a lens and some call it a filter, some are made with a single piece of glass, others with a double piece, at the end of the day, does it really make one iota of difference?

Tracy B. Loc: Indiana

brittainsas1 wrote:

Oh bouy, You should be docked for that ! What I sea, is a really biting remark here ! So water you really mean by that ? I hake to say it, but it's time that Tracy B. get's put in the punitentiary as well !

:lol:

Psergel Loc: New Mexico

DaveO wrote:

Hmmm, no remarks about Spam......been around since 1937, popular in WW2 and big in Israel. All the veracity of any major brand CPL, two piece style.

Also big in Hawaii.