Use of 2 polarizers (Page 2): Yes, but there may be other effects. Some polarizing filters can produce color shifts.

DirtFarmer Loc: Escaped from the NYC area, back to MA

Yes, but there may be other effects. Some polarizing filters can produce color shifts.

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BebuLamar wrote:

Use the linear ones work better.

The front PL *must NOT* be a CPL. Think it through (although that would grossly violate UHH Sacred Tradition).

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Stan Fayer wrote:

Using linear filters (2) I have been able to block out light completely .

Linear is really the way to go, but verrrrry few Hawgsters understand LPLs versus CPLs. They mostly just parrot myth and misinformation.

The purpose of a CPL is to depolarize all the light that it transmits. You cant cross polarize light that isnt polarized light in the first place.

(FWIW, if forced to use two CPLs, you could just flip the front one around backwards.)

jackpinoh Loc: Kettering, OH 45419

Stan Fayer wrote:

Instead of using several ND filters is it posable to use 2 polarizing filters to restrict the light?

Great in theory, but not in practice. When you stack filters, you increase the likelihood of vignetting the corners of the recorded image. Any color cast will be multiplied by 2. I have seen several reviews of variable neutral density filters that rely on polarization such as you suggest. You can search for them yourself. You will find that variable neutral density filters generally produce poor results compared to the alternatives.

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

Stan Fayer wrote:

Instead of using several ND filters is it posable to use 2 polarizing filters to restrict the light?

sure.

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jackpinoh wrote:

Great in theory, but not in practice. When you stack filters, you increase the likelihood of vignetting the corners of the recorded image. Any color cast will be multiplied by 2. I have seen several reviews of variable neutral density filters that rely on polarization such as you suggest. You can search for them yourself. You will find that variable neutral density filters generally produce poor results compared to the alternatives.

Cross POLarizing does NOT cause vignetting. Thaz just ridiculous. As to color cast, thaz a very minor thing thaz easily handled in PP. Just another typical UHH unfounded worry ... unless acoarst youre still shooting E6 !

Hawgsters obsess over over even the tinyest potential technical imperfection, which is only reasonable cuz most of their photographs are generally amazing creative works that should never be blemished by even the slightest of imperfections. Just surf the Photo Gallery to appreciate the creative tsunami that is UHH.

Creative tsunami ? You go, girls !

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BebuLamar

User ID wrote:

The front PL *must NOT* be a CPL. Think it through (although that would grossly violate UHH Sacred Tradition).

I never use the CPL so really I don't know. I know it doesn't work as well as a linear and cost more.

Timmers Loc: San Antonio Texas.

Hip Coyote wrote:

Why not three or perhaps add a red filter with a dehaze filter?

Bruce Lee was quoted as saying the key to brilliance is simplicity. True in martial arts and true in most things. Need to cut down on reflections? Use a polarizer. Need to reduce light to get a longer shutter speed, use an ND filter. Don’t fumble around with this unless it is some sort of experiment for experiment's sake.
Otherwise. Simplify and go make some photos.

Why not three polarizers. Because the central polarizer at a 45 degree angle to the front and rear polarizer will in point negate the ND effect. Basis modern physics that is a part of Bell's Theorem*.

* https://www.bing.com/search?q=bell%27s+theorem+for+dummies&qs=SS&pq=bell%27s+theorem&sk=HS2&sc=10-14&cvid=B1E45AC5A3A54D969375479CF73905FC&FORM=QBRE&sp=3&ghc=1&lq=0

larryepage Loc: North Texas area

BebuLamar wrote:

I never use the CPL so really I don't know. I know it doesn't work as well as a linear and cost more.

The world is incredibly resistant to this new bit of knowledge, but CPL filters are not required with mirrorless cameras. Linear polarizers will work just fine. The problem was interaction between the polarizer and the polarizing effect of the angled mirror with the TTL metering system.. No mirror, no interaction, no problem.

imagemeister Loc: mid east Florida

Stan Fayer wrote:

Using linear filters (2) I have been able to block out light completely .

BebuLamar

larryepage wrote:

The world is incredibly resistant to this new bit of knowledge, but CPL filters are not required with mirrorless cameras. Linear polarizers will work just fine. The problem was interaction between the polarizer and the polarizing effect of the angled mirror with the TTL metering system.. No mirror, no interaction, no problem.

I have no problem with linear polarizer and the SLR (or DSLR) metering system. I heard the problem is with the AF not metering.

larryepage Loc: North Texas area

BebuLamar wrote:

I have no problem with linear polarizer and the SLR (or DSLR) metering system. I heard the problem is with the AF not metering.

No. This goes back to TTL metering in film days way before AF came along.

Of course, AF could be affected by the loss of close to 2 stops of light in a polarizing filter, but not because of the polarization of the light.

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Timmers wrote:

Why not three polarizers. Because the central polarizer at a 45 degree angle to the front and rear polarizer will in point negate the ND effect. Basis modern physics that is a part of Bell's Theorem*.

* https://www.bing.com/search?q=bell%27s+theorem+for+dummies&qs=SS&pq=bell%27s+theorem&sk=HS2&sc=10-14&cvid=B1E45AC5A3A54D969375479CF73905FC&FORM=QBRE&sp=3&ghc=1&lq=0

Ya know ? ... Hes really SERIOUS !

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larryepage wrote:

The world is incredibly resistant to this new bit of knowledge, but CPL filters are not required with mirrorless cameras. Linear polarizers will work just fine. The problem was interaction between the polarizer and the polarizing effect of the angled mirror with the TTL metering system.. No mirror, no interaction, no problem.

LPLs never did cause any malfunctions of any of that older gear, but they did cause a minor user inconvenience in certain limited, clearly defined situations. It could slow you down.

Don, the 2nd son Loc: Crowded Florida

BebuLamar wrote:

I never use the CPL so really I don't know. I know it doesn't work as well as a linear and cost more.